Use of fractionated products of gamboge resin in the treatment of cancer, pain, and inflammation

ABSTRACT

Disclosed herein are seventeen new compounds and five fractionated products obtained from an acetone-extracted product of gamboge resin. The seventeen new compounds and the five fractionated products have activities in inhibiting the growth of tumor/cancer cells. In addition, the acetone-extracted product of gamboge resin and the five fractionated products obtained therefrom have analgesic and anti-inflammatory effects.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority of Taiwanese Application No. 099119107, filed on Jun. 11, 2010.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to seventeen new compounds and five fractionated products obtained from an acetone-extracted product of gamboge resin. The seventeen new compounds and the five fractionated products have been demonstrated to have activities in inhibiting the growth of tumor/cancer cells. In addition, the acetone-extracted product of gamboge resin and the five fractionated products obtained therefrom have been demonstrated to have analgesic and anti-inflammatory effects. Therefore, this invention also relates to the use of said acetone-extracted product of gamboge resin, the five fractionated products thereof, and the seventeen new compounds in the preparation of pharmaceutical compositions.

2. Description of the Related Art

Gamboge resin is the gum-resin secreted by the plant of Garcinia sp. of the family Guttiferae. It has been used as a source of vegetative dyes and pigments since the old days. It is also used in folk medicine in some areas such as India and Thailand.

Garcinia (TENGHUANG in pinyin), which is commonly known as gamboge, is a kind of evergreen trees that grow in tropical regions. The main species grown in India is “Garcinia morella Desv,” whereas the main species grown in Thailand is “G. harburyi Hook f.” Before the flowering period, the bark of the tree is cut open in a spiral shape about 2 meters from the ground to collect the exuding resin. The resin is then subjected to heat-drying to result in a solidified gamboge resin.

According to traditional Chinese medicine (TCM), gamboge is effective in combating inflammations, clearing away toxins, stopping blood bleeding, and killing worms. Ever since 1934, there have been a number of reports on the components of the gamboge resin. At present, it is known that many compounds can be isolated from extracts of gamboge resin, including: morellin, morellic acid, gambogic acid, morellinol, isomorellin, isomorellic acid, isogambogic acid, isomorellinol, neogambogic acid, desoxymorellin, dihydroisomorellin, α-guttiferin, β-guttiferin, gambogenic acid, desoxygambogenin, gambogellic acid, epigambogic acid, epiisogambogic acid, isogambogenic acid, 30-hydroxygambogic acid, etc.

Some studies have reported the cytotoxic activity of certain components of gamboge resin on human cervical cancer cells HeLa, human nasopharyngeal cancer cells KB, human leukemia cells K562, and doxorubicin-resistant K562 cell lines, etc. (J. Asano at al. (1996), Phytochemistry, 41:815-820; L. J. Lin at al. (1993), Magnetic Resonance in Chemistry, 31:340-347; Q. B. Han et al. (2006), Planta Med., 72:281-284; Q. B. Han et al. (2006), Chem. Pharm. Bull., 54:265-267; Q. B. Han at al. (2006), Chemistry & Biodiversity, 3:101-105).

U.S. Pat. No. 6,462,041 B1 has disclosed gambogic acid and its analogs and derivatives as represented by the following Formulae I, II and III:

-   -   wherein a dash line denotes a single bond, a double bond, or an         epoxy group; and X, Y, and R₁ to R₃ have the definitions as         disclosed in said US patent.

Compounds having one of the aforesaid Formulae I-III are disclosed to be activators of caspases and inducers of apoptosis. However, U.S. Pat. No. 6,462,041 B1 has disclosed neither a compound of Formula I that has a 32,33-epoxy group, nor a process for preparing the same.

In Acta Chimica Sinica, 2008, 66(22):2513-2517, Ming-Meia Jia at al. studied the chemical components of Garcinia hanburyi and isolated fifteen compounds from the cold ethanol-extracted product of Garcinia hanburyi via silica gel column chromatography (gradient elution solvent system: petroleum ether-acetone, acetone, methanol) and preparative HPLC. According to structure indentification, the fifteen compounds were identified as 2α-hydroxy-3β-acetoxy-lup-20(29)-en-28-oic acid (1), 10α-hydroxyepigambogic acid (2), gambogic acid (3), isogambogic acid (4), gambogin (5), gambogoic acid B (6), desoxymorellin (7), isomorellin (8), gambogenic acid (9), isogambogenin (10), gambogellic acid (11), desoxygambogenin (12), morellic acid (13), isomorellic acid (14), and 30-hydroxygambogic acid (15).

U.S. Pat. No. 7,138,428 B2 (corresponding to TW 1282280 and CN 100413868 C) has disclosed an acetone-extracted product from gamboge resin, i.e., TSB-14. In addition, nine compounds were further purified from said acetone-extracted product TSB-14, including a new compound formoxanthone A, and eight known compounds betulin, betulinic acid, morellic acid, isomorellic acid, gambogic acid, isogambogic acid, isomorellinol and desoxymorellin.

The acetone-extracted product TSB-14 and the nine purified compounds have been demonstrated to have effects in inhibiting the growth of tumor/cancer cells such as liver cancer cells (HepG2), lung cancer cells (A549), breast cancer cells (MCF-7), colon cancer cells (HT-29), leukemia cells (HL-60), and lymphoma cancer cells (U937).

US 2007/0093456 A1 has disclosed a derivative of gambogic acid, which is identified as “methyl 37,38-dihydroxy-gambogate” and has the following chemical structure:

It has been found from experiments that methyl 37,38-dihydroxy-gambogate can act as an activator of caspases and an inducer of apoptosis.

In Journal of Natural Products (2009), 72:117-124, S. J. Tao et al. reported that twelve new xanthones (such as oxygambogic acid shown below, methyl 8,8a-dihydromorellate, 7-methoxygambogellic acid, etc.) and a pair of new natural products (i.e., 8,8a-dihydro-8-hydroxygambogic acid and its isomer) were isolated from the resin of G. hanbury.

The stereostructure of oxygambogic acid has yet to be confirmed since the configuration of the C₁₅/C₁₆ double bond could not be determined due to the overlapping of the H-15 and H-16 signals in the ¹H-NMR spectral data. S. J. Tao et al. further found from pharmacological experiments that in addition to methyl 8,8a-dihydromorellate, all of the other tested thirteen compounds were effective in inhibiting the growth of HeLa cancer cells.

In addition to the activities in inhibiting the growth of tumor/cancer cells, the extracts of gamboge resin have been demonstrated to have other biological activities. For instance, in the report of A. Panthong et al. Journal of Ethnopharmacology (2007), 111:335-340, an ethyl acetate extract obtained from the resin of G. hanburyi Hook f. and named GH5763 was demonstrated to exhibit anti-inflammatory, analgesic and antipyretic activities.

Despite the aforesaid, there still exists a need for medicinal chemists and pharmaceutical manufacturers in the pharmaceutical industry to explore new compound(s) or new extract(s) that can be easily prepared and that exhibit desirable biological activities such as anti-cancer activity, analgesic activity, anti-inflammatory activity, etc.

Upon further investigation, the applicants have found that the acetone-extracted product from gamboge resin as disclosed in U.S. Pat. No. 7,138,428 B2, i.e., TSB-14, exhibits analgesic and anti-inflammatory activities. The applicants further obtained seventeen new compounds and five fractionated products from the acetone-extracted product TSB-14 of gamboge resin, in which the seventeen new compounds have been demonstrated to have anti-cancer activity, and the five fractionated products have been demonstrated to have anti-cancer, analgesic and anti-inflammatory activities.

SUMMARY OF THE INVENTION

Therefore, according to a first aspect, this invention provides a fractionated product of gamboge resin, which is prepared by a process comprising:

providing an acetone-extracted product from gamboge resin by pulverizing gamboge resin into powder, followed by extracting the pulverized powder with acetone;

fractionating the acetone-extracted product by semi-preparative RP-HPLC so as to provide five eluates;

separately concentrating the five eluates, followed by partitioning in H₂O and ethyl acetate, so as to obtain five crude fractionated products, and

separately refining the five crude fractionated products by semi-preparative RP-HPLC, concentrating, and partitioning in H₂O and ethyl acetate, so that a consistent elution profile for each of the five crude fractionated products is obtained,

wherein the fractionated product is selected from the groups consisting of:

-   -   (1) a fractionated product comprising formoxanthone A,         -   a compound of the formula

-   -   -   a compound of the formula

-   -   -   a compound of the formula

-   -   -   a compound of the formula

-   -   -   a compound of the formula

-   -   -   a compound of the formula

-   -   -   a compound of the formula

-   -   -   a compound of the formula

-   -   -   a compound of the formula

-   -   -   a compound of the formula

and a compound of the formula

-   -   (2) a fractionated product comprising isomorellic acid, morellic         acid, and isomorellinol;     -   (3) a fractionated product comprising 30-hydroxyepigambogic         acid, 30-hydroxygambogic acid, neogambogic acid, a compound of         the formula

and a compound of the formula

-   -   (4) a fractionated product comprising isomorellin, isogambogenic         acid, gambogenic acid, and a compound of the formula

and

-   -   (5) a fractionated product comprising gambogic acid, epigambogic         acid, isogambogic acid, epiisogambogic acid, desoxymorellin,         desoxygambogenin, gambogellic acid, epigambogellic acid, a

compound of the formula a

compound of the formula and a

compound of the formula

According to a second aspect, this invention provides a pharmaceutical composition comprising at least one of the fractionated products described above.

According to a third aspect, this invention provides an analgesic composition comprising at least one of the following:

-   -   (1) an acetone-extracted product from gamboge resin obtained by         pulverizing gamboge resin into powder, followed by extracting         the pulverized powder with acetone; and     -   (2) a fractionated product as described above.

According to a fourth aspect, this invention provides an anti-inflammatory composition comprising at least one of the following:

-   -   (1) an acetone-extracted product from gamboge resin obtained by         pulverizing gamboge resin into powder, followed by extracting         the pulverized powder with acetone; and     -   (2) a fractionated product as described above.

According to a fifth aspect, this invention provides an anti-cancer composition comprising at least one of the fractionated products described above.

According to a sixth aspect, this invention provides a method of inhibiting the growth of tumor/cancer cells, comprising contacting the cells with at least one of the fractionated products described above.

According to a seventh aspect, this invention provides a method of treating a cancer in a subject, comprising administering to the subject at least one of the fractionated products described above.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of this invention will become apparent with reference to the following detailed description and the preferred embodiments taken in conjunction with the accompanying drawings, in which:

FIG. 1 shows the analytical RP-HPLC elution profile of an acetone-extracted product from gamboge resin, which is referred to as “TSB-14” hereinafter and which was prepared according to the method disclosed in Example 1 of U.S. Pat. No. 7,138,428 B2, in which peaks 1-35 respectively correspond to the thirty-five major components discovered during the retention time from 0 to 80 minutes;

FIG. 2 shows the elution profile of the product TSB-14 obtained from the semi-preparative RP-HPLC analysis conducted in section A, entitled “Semi-preparative RP-HPLC analysis of the product TSB-14,” of Example 2, infra, in which the observed peaks 1-35 correspond to those shown in of FIG. 1, respectively;

FIG. 3 shows the semi-preparative RP-HPLC elution profile of fraction 1 obtained in section B, entitled “Preparation of fractions 1-3” of Example 2, infra, in which the observed twelve peaks correspond to peaks 1-12 shown in FIG. 2, respectively;

FIG. 4 shows the semi-preparative RP-HPLC elution profile of fraction 2 obtained in Example 2, infra, in which the observed twelve peaks correspond to peaks 13-24 shown in FIG. 2, respectively;

FIG. 5 shows the semi-preparative RP-HPLC elution profile of fraction 3 obtained in Example 2, infra, in which the observed eleven peaks correspond to peaks 25-35 shown in FIG. 2, respectively;

FIG. 6 shows the elution profile of the product TSB-14 obtained from the semi-preparative RP-HPLC analysis conducted in section A, entitled “Semi-preparative RP-HPLC analysis of the product TSB-14,” of Example 4, infra;

FIG. 7 shows the semi-preparative RP-HPLC elution profile of a fractionated product TSB-14A obtained in Example 4, infra, in which the observed twelve peaks correspond to peaks 1-12 shown in FIG. 1, respectively;

FIG. 8 shows the semi-preparative RP-HPLC elution profile of a fractionated product TSB-14B obtained in Example 4, infra, in which the observed three peaks correspond to peaks 13-15 shown in FIG. 1, respectively;

FIG. 9 shows the semi-preparative RP-HPLC elution profile of a fractionated product TSB-14C obtained in Example 4, infra, in which the observed five peaks correspond to peaks 16-20 shown in FIG. 1, respectively;

FIG. 10 shows the semi-preparative RP-HPLC elution profile of a fractionated product TSB-14D obtained in Example 4, infra, in which the observed four peaks correspond to peaks 21-24 shown in FIG. 1, respectively; and

FIG. 11 shows the semi-preparative RP-HPLC elution profile of a fractionated product TSB-14E obtained in Example 4, infra, in which the observed eleven peaks correspond to peaks 25-35 shown in FIG. 1, respectively.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Taiwan or any other country.

For the purpose of this specification, it will be clearly understood that the word “comprising” means “including but not limited to”, and that the word “comprises” has a corresponding meaning.

Unless otherwise defined, all technical and scientific terms used herein have the meaning commonly understood by a person skilled in the art to which this invention belongs. One skilled in the art will recognize many methods and materials similar or equivalent to those described herein, which could be used in the practice of this invention. Indeed, this invention is in no way limited to the methods and materials described. For clarity, the following definitions are used herein.

As used herein, the term “active component” or “biologically active compound” is understood to include any substance or material, or combination of substances and materials, which is pharmacologically active and, hence, has therapeutic value.

As used herein, the term “fractionated product” refers to a product obtained by subjecting a biological sample to a fractionation treatment (e.g., chromatography) so that two or more fractions from the biological sample are separated and collected.

In Example 1 of U.S. Pat. No. 7,138,428 B2, the applicants disclosed an acetone-extracted product from gamboge resin, i.e., TSB-14, which was obtained by pulverizing gamboge resin into powder, followed by extracting the pulverized powder with acetone. The acetone-extracted product TSB-14 was further identified to contain formoxanthone A, betulin, betulinic acid, morellic acid, isomorellic acid, gambogic acid, isogambogic acid, isomorellinol, and desoxymorellin. In order to explore any other biologically active component(s) that might exist in the acetone-extracted product TSB-14, in this invention, the applicants employed analytical RP-HPLC (reversed phase high performance liquid chromatography) and semi-preparative RP-HPLC analyses to isolate and purify any possible new biologically active compound(s) existing in the acetone-extracted product TSB-14, and to prepare biologically active fractionated products from the acetone-extracted product TSB-14.

Firstly, the acetone-extracted product TSB-14 was subjected to an analytical RP-HPLC analysis using an analytical RP-C8 column (Luna 3μ C8(2)). As shown in FIG. 1, the obtained analytical RP-HPLC elution profile was observed to have 35 major peaks, which were designated as peaks 1 to 35, respectively.

The acetone-extracted product TSB-14 was then subjected to a semi-preparative RP-HPLC using a semi-preparative RP-C12 column (Synergi 4μ C12). The obtained semi-preparative RP-HPLC elution profile as shown in FIG. 2, which was found to have 35 major peaks comparatively corresponding to those shown in FIG. 1, was divided into three regions, in which Region 1 included peaks 1-12 discovered during the retention time from 0 to 42 minutes; Region 2 included peaks 13 to 24 discovered during the retention time from 42 to 135 minutes; and Region 3 includes peaks 25 to 35 discovered during the retention time from 135 to 280 minutes.

Based on the three divided regions shown in FIG. 2, the acetone-extracted product TSB-14 was fractionated by semi-preparative RP-HPLC to provide three eluates that respectively corresponded to said three divided regions. The three eluates thus collected were respectively subjected to the following treatment: partitioning a collected eluate in H₂O and ethyl acetate; after washing with H₂O so as to remove TEA, the organic layer was dried on anhydrous Na₂SO₄, filtered, and the organic solvent was removed using a vacuum rotatory evaporator. Three corresponding fractions 1-3 thus obtained were separately subjected to the semi-preparative RP-HPLC analysis to provide elution profiles as shown in FIGS. 3, 4 and 5, which were observed to have peaks 1-12, 13-24 and 25-35, respectively.

The obtained fraction 1 was subjected to the semi-preparative RP-HPLC analysis and, according to its elution profile shown in FIG. 3, twelve eulates that respectively corresponded to peaks 1-12 shown in FIG. 3 were collected. The collected eluates 1-12 were then subjected to the following treatment: partitioning a collected eluate in H₂O and ethyl acetate; after washing with H₂O so as to remove TFA, the organic layer was dried on anhydrous Na₂SO₄, filtered, and the organic solvent was removed using a vacuum rotatory evaporator, Twelve crude products were obtained, each of which was further purified. After completion of purification, twelve purified products were obtained from the eluates 1-12 of fraction 1 and were designated as Gh-3261, Gh-3271, Gh-3272, Gh-3311, Gh-3332, Gh-1036, Gh-3291, Gh-631, Gh-1052, Gh-3351, Gh-3353 and Gh-3352, respectively (see Table 1 of Example 2, infra).

Fraction 2 was treated in a manner identical to fraction 1, and according to its elution profile shown in FIG. 4, eluates 13-24 that respectively corresponded to peaks 13-24 shown in FIG. 4 were collected, and twelve purified products were further obtained from the eluates 13-24 of fraction 2 and were designated as Gh-47, Gh-4602, Gh-4601, Gh-1601-A, Gh-1050, Gh-1602, Gh-1631, Gh-2641-1, Gh-2501, Gh-2642, Gh-2507 and Gh-2505, respectively (see Table 2 of Example 2, infra).

Fraction 3 was likewise treated in a manner identical to fraction 1, and according to its elution profile shown in FIG. 5, eluates 25-35 that respectively corresponded to peaks 25-35 shown in FIG. 5 were collected, and eleven purified products were further obtained from the eluates 25-35 of fraction 3 and were designated as Gh-2508, Gh-2603-1, Gh-2603-2, Gh-1641, Gh-1642, Gh-2605, Gh-2606, Gh-2607-B, Gh-2607-1A, Gh-2301 and Gh-4301, respectively (see Table 3 of Example 2, infra)

The thirty-five products purified from fractions 1-3 were subjected to physical and chemical analyses, including melting point determination, nuclear magnetic resonance (NMR) spectroscopy (e.g., ¹H-NMR and ¹³C-NMR spectroscopy), mass spectrometry (e.g., electron impact mass spectrometry (EIMS), high-resolution electron impact mass spectrometry (HREIMS), fast atom bombardment mass spectrometry (FABMS), and high-resolution fast atom bombardment mass spectrometry (HRFABMS), etc), etc.

Product Gh-631 has been confirmed by chemical structure analysis to be a known compound, i.e., “formoxanthone A” disclosed in U.S. Pat. No. 7,138,428 B2, which has the following chemical structure:

Products Gh-4602 and Gh-47 have been confirmed by chemical structure analysis to be two known morellic acid stereoisomers, i.e., morellic acid and isomorellic acid, which have the following chemical structures, respectively:

Product Gh-4601 has been confirmed by chemical structure analysis to be a known derivative of isomorellic acid, i.e., isomorellinol, which has the following chemical structure:

Products Gh-1601-A and Gh-1602 have been confirmed by chemical structure analysis to be two known C-2 epimers of 30-hydroxygambogic acid, i.e., 30-hydroxygambogic acid and 30-hydroxyepigambogic acid, which have the following chemical structures, respectively:

Product Gh-2641-1 has been confirmed by chemical structure analysis to be neogambogic acid, which has the following chemical structure:

Product Gh-2501 has been confirmed by chemical structure analysis to be isomorellin, which has the following chemical structure:

Products Gh-2505 and Gh-2642 have been confirmed by chemical structure analysis to be two known gambogenic stereoisomers, i.e., gambogenic acid and isogambogenic acid, which have the following chemical structures, respectively:

Products Gh-2603-2 and Gh-2603-1 have been confirmed by chemical structure analysis to be two known C-2 epimers of gambogellic acid, i.e., gambogellic acid and epigambogellic acid, which have the following chemical structures, respectively:

Products Gh-1641 and Gh-1642 have been confirmed by chemical structure analysis to be two known C-2 epimers of isogambogic acid, i.e., isogambogic acid and epiisogambogic acid, which have the following chemical structures, respectively:

Products Gh-2605 and Gh-2606 have been confirmed by chemical structure analysis to be two known C-2 epimers of gambogic acid, i.e., gambogic acid and epigambogic acid, which have the following chemical structures, respectively:

Product Gh-2301 has been confirmed by chemical structure analysis to be a known compound, i.e., desoxymorellin, which has the following chemical structure:

Product Gh-4301 has been confirmed by chemical structure analysis to be a known compound, i.e., desoxygambogenin, which has the following chemical structure:

It has been confirmed from the results of chemical structure analysis and a comparison with the spectroscopic data of known compounds that products Gh-3352 and Gh-3351 are two novel compounds which are hitherto not reported. Products Gh-3352 and Gh-3351, which are C-2 epimers with the following chemical structures, are herein named as “formoxanthone E” and “epiformoxanthone E,” respectively:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that products Gh-1052 and Gh-1036 are two novel compounds which are hitherto not reported. Products Gh-1052 and Gh-1036, which are C-2 epimers with the following chemical structures, are herein named as “formoxanthone F” and “epiformoxanthone F,” respectively:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that products Gh-3353 and Gh-3311 are two novel compounds which are hitherto not reported. Products Gh-3353 and Gh-3311, which are C-2 epimers with the following chemical structures, are herein named as “formoxanthone G” and “epiformoxanthone G,” respectively:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that products Gh-3261 and Gh-3271 are two novel compounds which are hitherto not reported. Products Gh-3261 and Gh-3271, which are C-2 epimers with the following chemical structures, are herein named as “formoxanthone J” and “epiformoxanthone J,” respectively:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that product Gh-3272 is a novel compound which is hitherto not reported. Product Gh-3272 is herein named as “formoxanthone H” and has the following chemical structure:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that product Gh-3332 is a novel compound which is hitherto not reported. Product Gh-3332 is herein named as “isoformoxanthone I” and has the following chemical structure:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that product Gh-3291 is a novel compound which is hitherto not reported. Product Gh-3291 is herein named as “formoxanthone D” and has the following chemical structure:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that product Gh-1631 is a novel compound which is hitherto not reported. Product Gh-1631 is herein named as “formoxanthone C” and has the following chemical structure:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that product Gh-1050 is a novel compound which is hitherto not reported. Product Gh-1050 is herein named as “3α-hydroxygambogellic acid” and has the following chemical structure:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that products Gh-2508 and Gh-2507 are two novel compounds which are hitherto not reported. Products Gh-2508 and Gh-2507, which are C-2 epimers with the following chemical structures, are herein named as “β-gambogellic acid” and “β-epigambogellic acid,” respectively:

It has been confirmed from the result of chemical structure analysis and a comparison with the spectroscopic data of known compounds that products Gh-2607-B and Gh-2607-1A are two novel compounds which are hitherto not reported. Products Gh-2607-B and Gh-2607-1A are C-2 epimers with the following chemical structures, are herein named as “formoxanthone B” and “epiformoxanthone B,” respectively:

After comparing the chemical structures of the seventeen new compounds obtained from fractions 1-3, the applicants found that these seventeen new compounds share a common skeleton structure and may be represented by the following formula (I):

wherein:

R₁ and R₂ together form a moiety selected from the group consisting of:

R₃ is selected from the group consisting of: 3-methyl-2-butenyl, 1-hydroxy-2,3-epoxy-3-methylbutyl 2,3-epoxy-3-methylbutyl, and 2,3-dihydroxy-3-methylbutyl; and

R₄ is selected from the group consisting of: 3-carboxyl-2Z-butenyl, 3-carboxyl-2E-butenyl, 3-carboxyl-1E-butenyl;

but excluding compounds of the following formulae:

According to the chemical structure shown in the above formula (I), the seventeen new compounds obtained in this invention may be chemically synthesized by methodologies well known to those skilled in the art.

In this invention, the acetone-extracted product TSB-14 was further subjected to a semi-preparative RP-HPLC analysis performed under different elution conditions so that an elution profile as shown in FIG. 6 was obtained. The elution profile of FIG. 6 was then divided into five regions, in which region A corresponded to the retention times from 0 to 13.7 minutes; region B corresponded to the retention times from 13.7 to 20.4 minutes; region C corresponded to the retention times from 20.4 to 26.1 minutes; region D corresponded to the retention times from 26.1 to 34.9 minutes; and region E corresponded to the retention times from 34.9 to 53.8 minutes.

Based on the five divided regions shown in FIG. 6, the acetone-extracted product TSB-14 was fractionated by semi-preparative RP-HPLC to provide five eluates that corresponded to the five divided regions A-E, respectively. The five eluates A-E thus collected were respectively subjected to the following treatment: partitioning a collected eluate in H₂O and ethyl acetate; after washing with H₂O so as to remove TFA, the organic layer was dried on anhydrous Na₂SO₄, filtered, and the organic solvent was removed using a vacuum rotatory evaporator. Five corresponding crude fractionated products A-E thus obtained were subsequently refined by semi-preparative RP-HPLC, concentrating, and partitioning in H₂O and ethyl acetate, respectively, so that a consistent elution profile for each of the five crude fractionated products is obtained. After refining, five fractioned products from the product TSB-14 were obtained, i.e., TSB-14A, TSB-14B, TSB-14C, TSB-14D, and TSB-14E, the semi-preparative RP-HPLC elution profiles of which are shown in FIGS. 7-11, respectively.

Comparing the elution profiles shown in FIGS. 7-11 with that of FIG. 1, the fractioned products TSB-14A, TSB-14B, TSB-14C, TSB-14D, and TSB-14E were found to contain peaks that corresponded to peaks 1-12, peaks 13-15, peaks 16-20, peaks 21-24, and peaks 25-35 shown in FIG. 1, respectively, indicating that the fractionated product TSB-14A contains Products Gh-3261, Gh-3271, Gh-3272, Gh-3311, Gh-3332, Gh-1036, Gh-3291, Gh-631, Gh-1052, Gh-3351, Gh-3353 and Gh-3352; the fractionated product TSB-14B contains Products Gh-47, Gh-4602 and Gh-4601; the fractionated product TSB-14C contains Products Gh-1601-A, Gh-1050, Gh-1602, Gh-1631 and Gh-2641-1; the fractionated product TSB-14D contains Products Gh-2501, Gh-2642, Gh-2507 and Gh-2505; and the fractionated product TSB-14E contains Products Gh-2508, Gh-2603-1, Gh-2603-2, Gh-1641, Gh-1642, Gh-2605, Gh-2606, Gh-2607-B, Gh-2607-1A, Gh-2301 and Gh-4301.

In this invention, the seventeen new purified compounds and the five fractioned products TSB-14A to TSB-14E obtained from the acetone-extracted product TSB-14 from gamboge resin were subjected to in vitro anti-cancer tests and were found to exhibit inhibitory activities against the growth of tumor/cancer cells (such as human breast adenocarcinoma cells, human colon adenocarcinoma cells, human promyelocytic leukemia cells, human hepatocellular carcinoma cells, human lung carcinoma cells, and human histocytic lymphoma cells). In particular, the fractioned products TSB-14A to TSB-14E were found more effective than the acetone-extracted product TSB-14 in inhibiting the growth of tumor/cancer cells.

It is therefore contemplated that the seventeen new purified compounds and the five fractioned products TSB-14A to TSB-14E, as well as the acetone-extracted product TSB-14 per se, have potential for use in cancer therapy.

The acetone-extracted product TSB-14 and the five fractionated products TSB-14A to TSB-14E obtained therefrom were further tested for their activities and binding abilities to nine cancer-related proteins, including: cyclooxygenase-2 (COX-2); protein serine/threonine kinases AURKB (Aurora-B kinase) and CDC2/CCNB1 (cdk1/cyclin B); protein tyrosine kinases ABL1 (ABL), epidermal growth factor receptor (EGFR), ERBB2 (HER2), insulin receptor and KDR (VEGFR-2). The obtained results show that the acetone-extracted product TSB-14 and the five fractionated products TSB-14A to TSB-14E obtained therefrom exhibit a significant inhibitory activity upon the tested cancer-related proteins. Inasmuch as the nine tested cancer-related proteins are known to be associated with various tumors/cancers (e.g., colorectal cancer, gastric cancer, non-small cell lung cancer, brain cancer, thyroid cancer, nasopharyngral cancer, chronic myelocytic leukemia, T-cell acute lymphoblastic leukemia, lung cancer, colon cancer, breast cancer, leukemia, liver cancer, ovarial cancer, renal cancer, pancreas cancer, and endometrial cancer), it is contemplated that the acetone-extracted product TSB-14 and the five fractionated products TSB-14A to TSB-14E obtained therefrom can be used in the treatment of tumors/cancers.

Accordingly, this invention provides a compound purified from gamboge resin and selected from the group consisting of:

(1) a compound of the formula:

(2) a compound of the formula:

(3) a compound of the formula:

(4) a compound of the formula:

(5) a compound of the formula:

(6) a compound of the formula:

(7) a compound of the formula:

(8) a compound of the formula:

(9) a compound of the formula:

(10) a compound of the formula:

(11) a compound of the formula:

(12) a compound of the formula:

(13) a compound of the formula:

(14) a compound of the formula:

(15) a compound of the formula:

(16) a compound of the formula:

and

(17) a compound of the formula:

This invention also provides a fractionated product of gamboge resin, which is prepared by a process comprising:

providing an acetone-extracted product from gamboge resin by pulverizing gamboge resin into powder, followed by extracting the pulverized powder with acetone;

fractionating the acetone-extracted product by semi-preparative RP-HPLC so as to provide five eluates;

separately concentrating the five eluates, followed by partitioning in H₂O and ethyl acetate, so as to obtain five crude fractionated products, and

separately refining the five crude fractionated products by semi-preparative RP-HPLC, concentrating, and partitioning in H₂O and ethyl acetate, so that a consistent elution profile for each of the five crude fractionated products is obtained, wherein the fractionated product is selected from the groups consisting of:

-   -   (1) a fractionated product comprising formoxanthone A, and the         compounds defined in sub-items (7), (8), (9), (10), (11), (12),         (13), (14), (15), (16) and (17) as described above;     -   (2) a fractionated product comprising isomorellic acid, morellic         acid, and isomorellinol;     -   (3) a fractionated product comprising 30-hydroxyepigambogic         acid, 30-hydroxygambogic acid, neogambogic acid, and the         compounds defined in sub-items (5) and (6) as described above;     -   (4) a fractionated product comprising isomorellin, isogambogenic         acid, gambogenic acid, and a compound defined in sub-item (4) as         described above; and     -   (5) a fractionated product comprising gambogic acid, epigambogic         acid, isogambogic acid, epiisogambogic acid, desoxymorellin,         desoxygambogenin, gambogellic acid, epigambogellic acid, and the         compounds defined in sub-items (1), (2) and (3) as described         above.

This invention further provides a pharmaceutical composition comprising a compound as described above, a fractionated product as described above, or a combination thereof.

This invention also provides a method of inhibiting the growth of tumor/cancer cells, comprising contacting the cells with a compound as described above, a fractionated product as described above, or a combination thereof.

In addition, this invention further provides an anti-cancer composition comprising at least one of the following:

-   -   (1) a compound as described above;     -   (2) a fractionated product as described above; and     -   (3) an acetone-extracted product from gamboge resin obtained by         pulverizing gamboge resin into powder, followed by extracting         the pulverized powder with acetone.

This invention also provides a method of treating a cancer in a subject, comprising administering to the subject at least one of the following:

-   -   (1) a compound as described above;     -   (2) a fractionated product as described above; and     -   (3) an acetone-extracted product from gamboge resin obtained by         pulverizing gamboge resin into powder, followed by extracting         the pulverized powder with acetone.

In this invention, the acetone-extracted product TSB-14 and the five fractionated products TSB-14A to TSB-14E obtained therefrom were further found to have analgesic and anti-inflammatory effects.

Accordingly, this invention provides an analgesic composition comprising at least one of the following:

-   -   (1) an acetone-extracted product from gamboge resin obtained by         pulverizing gamboge resin into powder, followed by extracting         the pulverized powder with acetone; and     -   (2) a fractionated product as described above.

This invention also provides an anti-inflammatory composition comprising at least one of the following:

-   -   (1) an acetone-extracted product from gamboge resin obtained by         pulverizing gamboge resin into powder, followed by extracting         the pulverized powder with acetone; and     -   (2) a fractionated product as described above.

The pharmaceutical composition according to this invention can be formulated into a dosage form suitable for parenteral, topical, or oral administration using technology well known to those skilled in the art, which includes, but is not limited to, injections (e.g., sterile aqueous solutions or dispersions), sterile powder, tablets, troches, pills, capsules, and the like.

The pharmaceutical composition according to this invention can be parenterally administered via at least one of the following routes: intravenous injection, intramuscular injection, and subcutaneous injection.

In a preferred embodiment according to this invention, the pharmaceutical composition is formulated into a dosage form suitable for oral administration.

The pharmaceutical composition according to this invention can additionally comprise a pharmaceutically acceptable carrier widely employed in the art of drug-manufacturing. For instance, the pharmaceutically acceptable carrier may include one or more of the following agents: solvents, emulsifiers, suspending agents, decomposers, binding agents, excipients, stabilizing agents, chelating agents, diluents, gelling agents, preservatives, lubricants, absorption delaying agents, plasticizer, filling agents, disintegrants, surfactants, thickening agents, liposomes, and the like.

The dosage and the frequency of administration of the pharmaceutical composition according to this invention may vary depending on the following factors: the severity of the disease to be treated, the route of administration, and the weight, age, physical condition and response of the subject to be treated. For instance, the daily dosage of the pharmaceutical composition according to this invention may be 2.1 to 3.0 mg per kilogram of the body weight, and may be administered in a single dose or in several doses.

The present invention will be described in more detail with reference to the following examples, which are given for the purpose of illustration only and are not intended to limit the scope of the present invention.

EXAMPLES General Procedures

Melting point was determined using a micro melting-point apparatus (Yanaco, Japan).

EIMS spectra and HREIMS spectra were recorded on a MAT-95 XL high-resolution mass spectrometer.

FABMS spectra and HRFABMS spectra were recorded on a JEOL JMSSX SX 102A mass spectrometer or a Finnigan MAT 95 XL mass spectrometer.

¹H-NMR and ¹³C-NMR spectra, ¹H-¹H COSY (homonuclear correlation spectroscopy) spectra, HMQC (heteronuclear multiple-quantum coherence) spectra, HMBC (heteronuclear multiple-bond coherence) spectra, and NOESY (nuclear Overhauser effect spectroscopy) spectra, were recorded on a BRUKER AM400 spectrometer, a VARIAN GEMINI-400 spectrometer, or a BRUKER ADVANCE DMX-600 spectrometer, in which CDCl₃ or acetone-d₆ was used as a solvent for the NMR measurements, and the chemical shift (δ) is expressed in ppm relative to a standard.

Analytical reversed-phase high performance liquid chromatography (RP-HPLC) was performed using the following instruments: a Hitachi L-7400 UV detector, a Hitachi L-7100 pump, a Hitachi HPLC D-7000 system, a column oven (Super CO-150, Enshine, Taiwan), a guard column (SecurityGuard cartridge C8, size: 3.0 mm×4.0 mm, Phenomenex, USA), and an analytical column (Luna 3μ C8(2) 100 Å, size: 4.6 mm×150 mm, Phenomenex, USA). Operation conditions for analytical RP-HPLC were as follows: a sample injection volume of 5 μL; mobile phase: 0.05% trifluoroacetic acid (TFA)_((aq.))/100% acetonitrile (35:65, v/v); column flow rate: 0.75 mL/min; column oven temperature: 35° C.; and detection wavelength: 360 nm.

Semi-preparative RP-HPLC was performed using the following instruments: a Hitachi L-7400 UV detector, a Hitachi L-7150 pump, a Hitachi HPLC D-7000 system, a column oven (Super CO-150, Enshine, Taiwan), a guard column (SecurityGuard Cartridge 012, size: 10 mm×10 mm, Phenomenex, USA), and an analytical column (Synergi 4μ C12 80 Å, size: 10 mm×150 mm, Phenomenex, USA). Operation conditions for semi-preparative RP-HPLC were as follows: a sample injection volume of 250 μL; mobile phase, which was selected depending on experiment; gradient elution, which was selected depending on experiment; column flow rate: 4.5 mL/min; column oven temperature: 27° C.; and detection wavelength: 360 nm.

Example 1 Analysis of an Acetone-Extracted Product from Gamboge Resin (TSB-14) by Analytical RP-HPLC

An acetone-extracted product from gamboge resin, i.e., TSB-14, which was prepared according to Example 1 of U.S. Pat. No. 7,138,428 B2, was subjected to an analytical RP-HPLC analysis, so as to determine the chemical constituent(s) contained therein.

Briefly, 1.0 mg of the product TSB-14 was dissolved in 1 mL of acetone and then subjected to an analytical RP-HPLC analysis along the lines as described in the previous section of “General Procedures,” and an elution profile as shown in FIG. 1 was obtained.

Referring to FIG. 1, 35 major peaks (numbered from 1 to 35) are present in the elution profile of the product TSB-14 within the retention time of 0 to 80 minutes. According to the results shown in FIG. 1, the applicants postulated that it might be possible to isolate 35 compounds from the product TSB-14. To verify this postulation, the product TSB-14 was subjected to the following experiments.

Example 2 Preparation of Purified Compounds from the Product TSB-14 A. Semi-Preparative RP-HPLC Analysis of the Product TSB-14

3 g of the product TSB-14 was dissolved in 30 mL of acetone/acetonitrile (v/v=1:9) and then subjected to a semi-preparative RP-HPLC analysis along the lines as described in the previous section of “General Procedures,” in which a mobile phase containing 0.05% TFA_((aq.))/65% acetonitrile_((aq.))(35:65) was used. The elution profile thus obtained is shown in FIG. 2.

After comparing the two elution profiles shown in FIGS. 1 and 2, the major peaks 1-35 as identified in FIG. 1 were also identified in the elution profile of FIG. 2, which was subsequently divided into three regions, i.e., Region 1, which includes peaks 1-12 eluted at a retention time of 0 to 42 minutes; Region 2, which includes peaks 13 to 24 eluted at a retention time of 42 to 135 minutes; and Region 3, which includes peaks 25 to 35 eluted at a retention time of 135 to 280 minutes.

B. Preparation of Fractions 1-3

3 g of the product TSB-14 was subjected to a semi-preparative RP-HPLC analysis as described in the preceding section A, and three eluates that respectively correspond to Regions 1, 2 and 3 of the elution profile shown in FIG. 2 were collected and then respectively subjected to the following treatment: partitioning a collected eluate in H₂O and ethyl acetate; after washing with H₂O so as to remove TFA, the organic layer was dried on anhydrous Na₂SO₄, filtered, and the organic solvent was removed using a vacuum rotatory evaporator.

After the aforesaid treatment of the three collected eluates, three corresponding fractions 1-3 were obtained.

C. Semi-Preparative RP-HPLC Analysis of Fractions 1-3

100 mg of each of fractions 1-3 as obtained in the preceding section B was dissolved in 1 mL of acetone, followed by subjecting to a semi-preparative RP-HPLC analysis as described in the preceding section A. The elution profiles of fractions 1-3 thus obtained are shown in FIGS. 3-5.

After comparing FIGS. 3, 4 and 5 with FIG. 2, it can be clearly seen that peaks 1-12, peaks 13-24 and peaks 25-35 are present in the semi-preparative RP-HPLC elution profiles of fractions 1, 2 and 3, respectively.

D. Preparation of Purified Compounds from Fraction 1

100 mg of fraction 1 as obtained in the preceding section B was dissolved in 1 mL of acetone, followed by subjecting to a semi-preparative RP-HPLC analysis as described in the preceding section A, in which eluates 1-12 that respectively correspond to the elution peaks 1-12 in the semi-preparative RP-HPLC elution profile of fraction 1 as shown in FIG. 3, were collected.

In order to obtain eluates 1-12 in large amount, elution of fraction 1 by the semi-preparative RP-HPLC analysis as described above was repeated for 50 to 100 times. Eluates 1-12 thus collected were individually placed into a 4 L brown glass bottle, followed by concentrating in a vacuum rotatory evaporator, to thereby give concentrates 1-12, each of which was in turn treated as follows: partitioning a concentrate in H₂O and ethyl acetate; after washing with H₂O so as to remove TFA, the organic layer was dried on anhydrous Na₂SO₄, filtered, and the organic solvent was removed using a vacuum rotatory evaporator.

After the aforesaid treatment of concentrates 1-12, twelve crude products were obtained, each of which was further purified as follows: 100 mg of a crude product was dissolved in 1.0 mL of acetone and then subjected to an analytical RP-HPLC analysis along the lines as described in the previous section of “General Procedures,” so that an analytical RP-HPLC elution profile containing only a single elution peak was obtained. If the obtained elution profile failed to show the presence of a single peak, the remainder of said crude product was subjected to further purification by repeating the above-described treatments until an analytical RP-HPLC elution profile showing a single peak was obtained.

After completion of purification, twelve purified products were obtained from the eluates 1-12 of fraction 1 and were designated as Gh-3261, Gh-3271, Gh-3272, Gh-3311, Gh-3332, Gh-1036, Gh-3291, Gh-631, Gh-1052, Gh-3351, Gh-3353 and Gh-3352, respectively. The obtained weights of these twelve purified products are summarized in Table 1.

TABLE 1 The weights of twelve purified products from fraction 1. Eluate/Peak Product Weight (mg) 1 Gh-3261 9 2 Gh-3271 8 3 Gh-3272 7 4 Gh-3311 7 5 Gh-3332 6 6 Gh-1036 10 7 Gh-3291 7 8 Gh-631 12 9 Gh-1052 6 10 Gh-3351 9 11 Gh-3353 7 12 Gh-3352 5 E. Preparation of Purified Compounds from Fraction 2

100 mg of fraction 2 as obtained in the preceding section B was dissolved in 1 mL of acetone, followed by subjecting to a semi-preparative RP-HPLC analysis as described in the preceding section A, in which eluates 13-24 that respectively correspond to the elution peaks 13-24 in the semi-preparative RP-HPLC elution profile of fraction 2 as shown in FIG. 4, were collected.

In order to obtain eluates 13-24 in large amount, elution of fraction 2 by the semi-preparative RP-HPLC analysis as described above was repeated for 50 to 100 times. Eluates 13-24 thus collected were individually placed into a 4 L brown glass bottle, followed by concentrating in a vacuum rotatory evaporator, to thereby give concentrates 13-24, each of which was in turn subjected to partitioning separation and purification according to the procedures as described in the preceding section D.

After completion of purification, twelve purified products were obtained from the eluates 13-24 of fraction 2 and were designated as Gh-47, Gh-4602, Gh-4601, Gh-1601-A, Gh-1050, Gh-1602, Gh-1631, Gh-2641-1, Gh-2501, Gh-2642, Gh-2507 and Gh-2505, respectively. The obtained weights of these twelve purified products are summarized in Table 2.

TABLE 2 The weights of twelve purified products from fraction 2. Eluate/Peak Product Weight (mg) 13 Gh-47 14 14 Gh-4602 48 15 Gh-4601 27 16 Gh-1601-A 20 17 Gh-1050 16 18 Gh-1602 16 19 Gh-1631 19 20 Gh-2641-1 17 21 Gh-2501 13 22 Gh-2642 19 23 Gh-2507 8 24 Gh-2505 56 F. Preparation of Purified Compounds from Fraction 3

100 mg of fraction 3 as obtained in the preceding section B was dissolved in 1 mL of acetone, followed by subjecting to a semi-preparative RP-HPLC analysis as described in the preceding section A, in which eluates 25-35 that respectively correspond to the elution peaks 25-35 in the semi-preparative RP-HPLC elution profile of fraction 3 as shown in FIG. 5, were collected.

In order to obtain eluates 25-35 in large amount, elution of fraction 3 by the semi-preparative RP-HPLC analysis as described above was repeated for 50 to 100 times. Eluates 25-35 thus collected were individually placed into a 4 L brown glass bottle, followed by concentrating in a vacuum rotatory evaporator, to thereby give concentrates 25-35, each of which was in turn subjected to partitioning separation and purification according to the procedures as described in the preceding section D.

After completion of purification, eleven purified products were obtained from the eluates 25-35 of fraction 3 and were designated as Gh-2508, Gh-2603-1, Gh-2603-2, Gh-1641, Gh-1642, Gh-2605, Gh-2606, Gh-2607-B, Gh-2607-1A, Gh-2301 and Gh-4301, respectively. The obtained weights of these eleven purified products are summarized in Table 3.

TABLE 3 The weights of eleven purified products from fraction 3. Peak Product Weight (mg) 25 Gh-2508 18 26 Gh-2603-1 16 27 Gh-2603-2 18 28 Gh-1641 20 29 Gh-1642 25 30 Gh-2605 162 31 Gh-2606 124 32 Gh-2607-B 10 33 Gh-2607-1A 12 34 Gh-2301 14 35 Gh-4301 22

Example 3 Identification and Characterization of Compounds Isolated and Purified from Fractions 1-3

The physical and chemical properties of the thirty five products purified as obtained from fractions 1-3 in the above Example 2 were analyzed according to the methodologies set forth in the preceding section of “General Procedures,” including melting point (mp) measurement, ¹H-NMR, ¹³C-NMR, ¹H-¹H COSY, HMQC, HMBC, NOESY, EIMS, HREIMS, FABMS, and HRFABMS. The experimental data thus obtained are summarized below.

1. Product Gh-47:

Product Gh-47, which was purified from eluate 13 of fraction 2, was determined to have the following properties:

Yellow flake crystals; mp 204˜209° C.

EIMS m/z (relative intensity): 560 [M]⁺ (100), 545 (47), 532 (22), 517 (36), 405 (44), 389 (11), 363 (24), 349 (17), 307 (12), 287 (22), 285 (16), 245 (15), 215 (12), 189 (5).

¹H-NMR (400 MHz, CDCl₃): δ 7.56 (1H, d, J=6.9 Hz), 6.63 (1H, d, J=9.6 Hz), 5.51 (1H, d, J=9.6 Hz), 5.12 (1H, dd, J=13.6, 6.8 Hz), 3.52 (1H, dd, J=6.2, 4.7 Hz), 3.26 (2H, d, J=7.4 Hz), 2.66 (1H, m), 2.55 (2H, m), 2.35 (1H, dd, J=13.4, 4.6 Hz), 1.75 (3H, s), 1.72 (3H, s), 1.65 (3H, s), 1.44 (3H, s), 1.43 (3H, s), 1.35 (3H, s), 1.30 (3H, s).

¹³C-NMR (100 MHz, CDCl₃): δ 200.93, 178.91, 171.86, 161.10, 157.64, 157.28, 136.97, 135.39, 133.35, 131.70, 128.63, 126.18, 122.12, 115.44, 108.27, 103.18, 100.49, 90.71, 83.71, 83.64, 78.65, 49.06, 46.88, 29.95, 28.93, 28.33, 25.71, 25.31, 21.62, 18.09, 11.34.

According to the obtained spectral data, product Gh-47 was identified to be a known compound having the following chemical structure, i.e., isomorellic acid:

2. Product Gh-631:

Product Gh-631, which was purified from eluate 8 of fraction 1, was determined to have the following properties:

Yellow needle crystals; mp 115˜118° C.

EIMS m/z (relative intensity): 394 [M]⁺ (66), 393 (23), 379 (100), 339 (30), 323 (16), 311 (13), 295 (5), 278 (10), 203 (4), 162 (7).

¹H-NMR (600 MHz, acetone-d₆): δ 13.09 (1H, s, OH-1), 7.40 (1H, s, H-8), 6.55 (1H, d, J=10.0 Hz, H-11), 6.32 (1H, s, H-2), 5.87 (1H, d, J=10.0 Hz, H-12), 5.36 (H, m, H-17), 3.55 (2H, d, J=7.3 Hz, H-16), 1.84 (3H, s, H-20), 1.63 (3H, s, H-19), 1.48 (6H, s, H-14, H-15).

¹³C-NMR (150 MHz, acetone-d₆): δ 181.24 (C═O), 163.41 (C-3), 162.26 (C−1), 155.56 (C-4a), 146.94 (C-6), 146.43 (C-10a), 134.42 (C-18), 132.30 (C-12), 131.77 (C-5), 123.33 (C-17), 122.08 (C-11), 119.03 (C-7), 115.20 (C-8a), 113.15 (C-8), 107.54 (C-4), 103.26 (C-9a), 98.40 (C-2), 78.84 (C-13), 28.26 (C-14, 15), 25.93 (C-19), 22.16 (C-16), 18.00 (C-20).

According to the obtained spectral data, product Gh-631 was identified to be a known compound having the following chemical structure, i.e., formoxanthone A:

3. Product Gh-4601:

Product Gh-4601, which was purified from eluate 15 of fraction 2, was determined to have the following properties:

Orange powder; mp 137˜139° C.

EIMS m/z (relative intensity): 546 [M]⁺ ((100), 531 (18), 518 (44), 503 (40), 485 (9), 433 (7), 405 (33), 391 (10), 363 (19), 349 (13), 307 (10), 287 (25), 245 (8), 231 (18), 214 (12), 189 (5), 105 (6).

¹H-NMR (400 MHz, CDCl₃): δ 12.68 (1H, s), 7.41 (1H, d, J=7.2 Hz), 6.59 (1H, d, J=10.0 Hz), 5.49 (1H, d, J=10.0 Hz), 5.19 (1H, t, J=7.0 Hz), 4.73 (1H, t, J=8.0 Hz), 3.61 (2H, q, J=10.2 Hz), 3.49 (1H, d, J=4.7 Hz), 3.47 (1H, d, J=4.7 Hz), 3.32 (1H, dd, J=14.5, 6.8 Hz), 3.24 (1H, dd, J=14.3, 7.7 Hz), 2.60 (1H, d, J=7.7 Hz), 2.48 (1H, d, J=9.4 Hz), 2.31 (1H, dd, J=13.5, 4.7 Hz), 1.74, 1.68, 1.64, 1.25, 1.01 (each 3H, s), 1.41 (6H, s).

¹³C-NMR (100 MHz, CDCl₃): δ 203.35, 180.33, 161.06, 157.80, 157.44, 138.01, 134.40, 133.63, 131.87, 126.31, 121.90, 118.20, 115.50, 108.44, 103.00, 100.72, 90.48, 84.50, 83.41, 78.66, 67.92, 49.09, 47.00, 30.09, 28.96, 28.28, 28.21, 25.71, 25.29, 21.57, 18.14, 12.49.

According to the obtained spectral data, product Gh-4601 was identified to be a known compound having the following chemical structure, i.e., isomorellinol:

4. Product Gh-4602:

Product Gh-4602, which was purified from eluate 14 of fraction 2, was determined to have the following properties:

Orange powder; mp 106˜109° C.

EIMS m/z (relative intensity): 560 [M]⁺ (100), 545 (56), 532 (63), 517 (48), 487 (12), 433 (9), 405 (81), 391 (22), 363 (38), 349 (24), 307 (18), 287 (64), 245 (40), 231 (21), 215 (20), 189 (10).

¹H-NMR (400 MHz, CDCl₃): δ 12.71 (1H, s), 7.51 (1H, d, J=6.8 Hz), 6.49 (1H, d, J=10.0 Hz), 6.05 (1H, t, J=7.0 Hz), 5.39 (1H, d, J=10.0 Hz), 4.99 (1H, d, J=6.0 Hz), 3.45 (1H, dd, J=6.4, 4.7 Hz), 3.27 (1H, m), 3.08 (1H, m), 2.97 (2H, sept, J=8.0 Hz), 2.49 (1H, d, J=9.3 Hz), 2.28 (1H, dd, J=13.4, 4.5 Hz), 1.70, 1.69, 1.67, 1.60, 1.36, 1.34, 1.26 (each 3H, s).

¹³C-NMR (100 MHz, CDCl₃): δ 203.47, 179.07, 171.74, 161.22, 157.65, 157.34, 138.46, 135.39, 133.42, 131.46, 127.64, 126.00, 122.22, 115.44, 108.04, 103.16, 100.55, 90.93, 83.82, 78.55, 49.01, 46.80, 29.87, 29.26, 28.82, 28.40, 28.20, 25.68, 25.14, 21.57, 20.63, 18.06.

According to the obtained spectral data, product Gh-4602 was identified to be a known compound having the following chemical structure, i.e., morellic acid:

5. Product Gh-2301:

Product Gh-2301, which was purified from eluate 34 of fraction 3, was determined to have the following properties:

Orange needle crystals, mp 109˜110° C.

EIMS m/z (relative intensity): 530 [M]⁺ (100), 515 (22), 502 (92), 488 (30), 487 (83), 459 (11), 433 (20), 405 (49), 391 (15), 363 (24), 349 (16), 307 (13), 287 (27), 231 (13), 215 (37), 189 (6).

¹H-NMR (400 MHz, CDCl₃): δ 12.89 (1H, s), 7.45 (1H, d, J=7.2 Hz), 7.27 (1H, s), 6.65 (1H, d, J=10.4 Hz), 5.53 (1H, d, J=9.6 Hz), 5.30 (1H, br d, J=6.0 Hz), 4.43 (1H, br s), 3.49 (1H, m), 3.32 (2H, m), 2.50 (2H, m), 2.34 (1H, m), 1.78, 1.71, 1.68, 1.59, 1.33, 1.03 (each 3H, s), 1.45 (6H, s).

According to the obtained spectral data, product Gh-2301 was identified to be a known compound having the following chemical structure, i.e., desoxymorellin:

6. Product Gh-4301:

Product Gh-4301, which was purified from eluate 35 of fraction 3, was determined to have the following properties:

Yellow gummy solid; mp 85˜88° C.

EIMS m/z (relative intensity): 600 [M]⁺ (100), 572 (77), 557 (21), 531 (10), 503 (60), 475 (26), 449 (33), 393 (9), 357 (12), 351 (26), 323 (9), 309 (16), 295 (45), 281 (12), 253 (53), 231 (18), 215 (40), 189 (10), 177 (18), 173 (12), 69 (65).

¹H-NMR (600 MHz, CDCl₃): δ 12.92 (1H, s), 7.41 (1H, d, J=7.0 Hz), 6.45 (1H, s), 5.19 (2H, m), 5.03 (1H, m), 4.39 (1H, m), 3.45 (1H, dd, J=6.9, 4.5 Hz), 3.36 (4H, m), 2.52 (2H, m), 2.43 (1H, d, J=9.4 Hz), 2.30 (1H, dd, J=13.5, 4.7 Hz), 2.05 (4H, m), 1.78 (3H, s), 1.74 (3H, s), 1.69 (3H, s), 1.654 (3H, s), 1.645 (3H, s), 1.56 (3H, s), 1.33 (3H, s), 1.30 (1H, m), 1.25 (3H, s), 0.98 (3H, s).

¹³C-NMR (150 MHz, CDCl₃): δ 203.55, 179.65, 162.98, 160.12, 156.29, 139.04, 134.91, 133.88, 133.80, 133.75, 131.88, 123.74, 121.86, 121.33, 117.76, 107.13, 106.39, 100.70, 90.12, 84.50, 83.11, 49.06, 46.90, 39.66, 30.03, 29.02, 28.78, 26.32, 25.70, 25.63, 25.49, 25.40, 22.05, 21.11, 18.01, 17.63, 16.68, 16.19.

According the obtained spectral data, product Gh-4301 was identified to be a known compound having the following chemical structure, i.e., desoxygambogenin:

7. Product Gh-2605:

Product Gh-2605, which was purified from eluate 30 of fraction 3, was determined to have the following properties:

Yellow powder; mp 205˜208° C.

EIMS m/z (relative intensity): 628 [M]⁺ (22), 600 (15), 545 (100), 517 (23), 473 (17), 431 (7), 389 (9), 355 (10), 295 (5), 271 (7), 245 (14), 215 (23), 189 (11), 69 (9).

¹H-NMR (600 MHz, CDCl₃): δ 12.73 (1H, s), 7.52 (1H, d, J=6.9 Hz), 6.57 (1H, d, J=10.2 Hz), 6.08 (1H, dt, J=7.5, 1.3 Hz), 5.35 (1H, d, J=10.2 Hz), 5.01 (2H, m), 3.46 (1H, dd, J=6.8, 4.6 Hz), 3.27 (1H, dd, J=14.7, 8.1 Hz), 3.12 (1H, br dd, J=14.7, 5.3 Hz), 2.93 (2H, t, J=7.3 Hz), 2.49 (1H, d, J=9.3 Hz), 2.29 (1H, dd, J=13.4, 4.7 Hz), 1.98 (2H, m), 1.72 (3H, d, J=1.3 Hz), 1.71 (1H, m), 1.70 (3H, s), 1.67 (3H, s), 1.62 (3H, s), 1.60 (3H, s), 1.56 (1H, m), 1.52 (3H, s), 1.35 (3H, s), 1.34 (1H, m), 1.27 (3H, s).

¹³C-NMR (150 MHz, CDCl₃): δ 203.28, 178.85, 170.88, 161.49, 157.55, 157.35, 137.90, 135.31, 133.34, 131.77, 131.49, 127.70, 124.49, 123.83, 122.25, 115.87, 107.60, 102.73, 100.44, 90.91, 83.92, 83.78, 81.28, 49.00, 46.81, 41.97, 29.85, 29.26, 28.84, 27.69, 25.64, 25.62, 25.16, 22.73, 21.60, 20.73, 18.06, 17.60.

According the obtained spectral data, product Gh-2605 was identified to be a known compound having the following chemical structure, i.e., gambogic acid:

8. Product Gh-2606:

Product Gh-2606, which was purified from eluate 31 of fraction 3, was determined to have the following properties:

Yellow powder; mp 88˜92° C.

EIMS m/z (relative intensity): 628 [M]⁺ (24), 600 (11), 545 (100), 517 (21), 473 (12), 431 (4), 389 (8), 347 (6), 245 (7), 215 (14), 189 (5), 69 (4).

¹H-NMR (600 MHz, CDCl₃): δ 12.74 (1H, s), 7.53 (1H, d, J=6.9 Hz), 6.56 (1H, d, J=10.0 Hz), 6.10 (1H, dt, J=7.4, 1.2 Hz), 5.38 (1H, d, J=10.0 Hz), 5.07 (1H, br t, J=7.1 Hz), 5.01 (1H, br t, J=6.3 Hz), 3.45 (1H, dd, J=6.5, 4.9 Hz), 3.29 (1H, dd, J=14.6, 8.3 Hz), 3.13 (1H, br dd, J=14.6, 4.3 Hz), 2.94 (1H, dd, J=16.1, 7.7 Hz), 2.87 (1H, dd, J=16.3, 6.3 Hz), 2.49 (1H, d, J=9.3 Hz), 2.28 (1H, dd, J=13.4, 4.7 Hz), 2.05 (2H, m), 1.75 (1H, m), 1.72 (3H, s), 1.71 (3H, s), 1.68 (3H, s), 1.64 (3H, s), 1.62 (1H, m), 1.61 (3H, s), 1.55 (3H, s), 1.35 (1H, m), 1.31 (3H, s), 1.26 (3H, s).

¹³C-NMR (150 MHz, CDCl₃): δ 203.25, 178.92, 170.68, 161.33, 157.59, 157.33, 137.73, 135.51, 133.21, 131.99, 131.39, 127.76, 124.76, 123.82, 122.24, 115.88, 107.79, 102.88, 100.51, 90.98, 83.86, 83.67, 81.10, 49.00, 46.82, 41.69, 29.91, 29.26, 28.78, 26.91, 25.67, 25.60, 25.20, 22.73, 21.61, 20.71, 18.12, 17.58.

According to the obtained spectral data, product Gh-2606 was identified to be a known compound having the following chemical structure, i.e., epigambogic acid:

9. Product Gh-1641:

Product Gh-1641, which was purified from eluate 28 of fraction 3, was determined to have the following properties:

Yellow powder; mp 53˜56° C.

EIMS m/z (relative intensity): 628 [M]⁺ (32), 600 (6), 545 (100), 517 (12), 473 (6), 431 (2), 389 (4), 355 (5), 245(8), 215 (11), 189 (3), 69 (5).

¹H-NMR (600 MHz, CDCl₃): δ 12.75 (1H, s), 7.53 (1H, d, J=6.9 Hz), 6.65 (1H, d, J=10.1 Hz), 6.61 (1H, t, J=7.5 Hz), 5.41 (1H, d, J=10.1 Hz), 5.09 (1H, t, J=6.9 Hz), 5.04 (1H, t, J=7.8 Hz), 3.49 (1H, dd, J=6.7, 4.6 Hz), 3.24 (2H, m), 2.63 (1H, dd, J=15.6, 8.2 Hz), 2.53 (1H, m), 2.51 (1H, d, J=9.3 Hz), 2.32 (1H, dd, J=13.5, 4.7 Hz), 2.02 (2H, dd, J=15.8, 7.7 Hz), 1.76 (1H, m), 1.70 (3H, s), 1.69 (3H, s), 1.63 (3H, s), 1.62 (3H, s), 1.59 (1H, m), 1.53 (3H, s), 1.38 (3H, s), 1.37 (1H, m), 1.34 (3H, s), 1.28 (3H, s).

¹³C-NMR (150 MHz, CDCl₃): δ 202.97, 178.81, 171.55, 161.41, 157.61, 157.35, 136.98, 135.31, 133.36, 131.81, 131.75, 128.56, 124.77, 123.82, 122.18, 115.93, 107.92, 102.82, 100.40, 90.71, 83.73, 83.65, 81.33, 49.05, 46.87, 41.92, 29.93, 29.05, 28.95, 27.49, 25.67, 25.61, 25.33, 22.75, 21.61, 18.08, 17.59, 11.39.

According to the obtained spectral data, product Gh-1641 was identified to be a known compound having the following chemical structure, i.e., isogambogic acid:

10. Product Gh-1642:

Product Gh-1642, which was purified from eluate 29 of fraction 3, was determined to have the following properties:

Yellow powder; mp 55-′60° C.

EIMS m/z (relative intensity): 628 [M]⁺ (63), 600 (13), 545 (100), 517 (17), 473 (17), 431 (8), 389 (7), 355 (7), 245 (8), 215 (10), 189 (3), 69 (18).

¹H-NMR (600 MHz, CDCl₃): δ 12.74 (1H, s), 7.52 (1H, d, J=7.1 Hz), 6.66 (1H, d, J=10.2 Hz), 6.50 (1H, t, J=7.9 Hz), 5.44 (1H, d, J=10.2 Hz), 5.12 (1H, t, J=6.9 Hz), 5.06 (1H, t, J=7.8 Hz), 3.49 (1H, dd, J=6.8, 4.5 Hz), 3.25 (2H, m), 2.61 (2H, m), 2.49 (1H, d, J=9.5 Hz), 2.32 (1H, dd, J=13.3, 4.7 Hz), 2.06 (2H, m), 1.78 (1H, m), 1.73 (3H, s), 1.70 (3H, s), 1.64 (3H, s), 1.63 (3H, s), 1.62 (1H, m), 1.55 (3H, s), 1.36 (3H, s), 1.34 (1H, m), 1.28 (3H, s), 1.23 (3H, s).

¹³C-NMR (150 MHz, CDCl₃): δ 202.92, 178.88, 170.95, 161.32, 157.63, 157.36, 136.75, 135.31, 133.33, 131.97, 131.74, 128.81, 124.81, 123.76, 122.14, 115.96, 107.92, 102.93, 100.49, 90.64, 83.67, 83.62, 81.29, 49.07, 46.95, 41.88, 30.03, 29.06, 28.98, 27.32, 25.71, 25.64, 25.48, 22.75, 21.65, 18.16, 17.62, 11.43.

According to the obtained spectral data, product Gh-1642 was identified to be a known compound having the following chemical structure, i.e., epiisogambogic acid:

11. Product Gh-2603-2:

Product Gh-2603-2, which was purified from eluate 27 of fraction 3, was determined to have the following properties:

Yellow powder; mp 131˜135° C.

EIMS m/z (relative intensity): 628 [M]⁺ (92), 600 (91), 545 (54), 517 (46), 474 (100), 473 (88), 459 (18), 431 (29), 417 (15), 391 (33), 355 (37), 349 (25), 295 (18), 253 (21), 245 (25), 215 (30), 189 (18), 69 (20).

¹H-NMR (600 MHz, CDCl₃): δ 12.62 (1H, s, OH-6), 7.47 (1H, d, J=6.9 Hz, H-10), 6.00 (1H, dd, J=7.6, 1.3 Hz, H-27), 5.04 (1H, t, J=6.9 Hz, H-32), 4.53 (1H, s, H₁-40), 4.19 (1H, s, H₂-40), 3.43 (1H, dd, J=13.4, 4.6 Hz, H-11), 3.40 (1H, br s, H-4), 3.23 (1H, dd, J=14.5, 8.1 Hz, H₁-31), 3.10 (1H, dd, J=14.5, 5.6 Hz, H₂-31), 2.94 (2H, d, J=7.5 Hz, H-26), 2.51 (1H, d, J=9.3 Hz, H-22), 2.28 (1H, dd, J=13.4, 4.7 Hz, H₁-21), 2.08 (1H, br d, J=12.6 Hz, H-37), 1.88 (1H, br d, J=13.6 Hz, H₁-20), 1.82 (3H, s, H-39), 1.77 (1H, dd, J=13.1, 2.8 Hz, H₁-3), 1.71 (1H, m, H₂-3), 1.70 (3H, s, H-34), 1.69 (3H, s, H-25), 1.68 (3H, s, H-29), 1.62 (3H, s, H-35), 1.52 (1H, dt, J=13.4, 4.9 Hz, H₂-20), 1.36 (1H, m, H₁-36), 1.33 (1H, m, H₂-21), 1.30 (3H, s, H-19), 1.29 (1H, m, H₂-36), 1.27 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 203.68 (C-12), 178.47 (C-8), 171.33 (C-30), 164.44 (C-18), 160.77 (C-6), 155.27 (C-16), 148.87 (C-38), 138.06 (C-27), 134.30 (C-10), 133.93 (C-9), 131.07 (C-33), 127.77 (C-28), 122.44 (C-32), 108.60 (C-40), 106.26 (C-17), 104.14 (C-5), 99.57 (C-7), 90.42 (C-14), 84.20 (C-23), 83.93 (C-13), 77.05 (C-2), 48.91 (C-22), 48.10 (C-37), 46.73 (C-11), 39.27 (C-20), 36.52 (C-3), 29.90 (C-25), 29.18 (C-26), 28.85 (C-4), 28.85 (C-24), 28.37 (C-19), 25.74 (C-35), 25.18 (C-21), 22.96 (C-39), 22.78 (C-36), 21.84 (C-31), 20.71 (C-29), 18.14 (C-34).

The EIMS data of Product Gh-2603-2 show a molecular ion peak [M]⁺ at m/z 628, which is identical to that observed in gambogic acid. In addition, the recorded ¹H-NMR and ¹³C-NMR data of Product Gh-2603-2 were found to be identical to those of a known compound, i.e., gambogellic acid, as further confirmed by the ¹H-¹H COSY, HMQC (J=150 Hz) and HMBC (J=8 Hz) spectral analyses (data not shown).

The NOESY data of Product Gh-2603-2 also reveal that δ 7.47 (H-10) was correlated with δ 3.43 (H-11); δ 3.43 (H-11) was correlated with δ 2.28 (H₁-21); δ 1.33 (H₂-21) was correlated with δ 2.51 (H-22); δ 2.28 (H₁-21) was correlated with δ 2.51 (H-22) and δ 1.27 (H-24); and δ 6.00 (H-27) was correlated with δ 1.68 (H-29), evidencing that the stereostructure of Product Gh-2603-2 in this part is identical to that of gambogic acid. Namely, the stereostructure of Product Gh-2603-2 in this part has a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. in the monoterpene moiety of Product Gh-2603-2, the signal of the methine proton attached to the isopropenyl group (i.e., δ 2.08 (1H, br d, J=12.6 Hz, H-37)) reveals that the methine proton attached to the isopropenyl group and a vicinal proton have a relatively high vicinal coupling constant (J=12.6 Hz) and, hence, they are in axial-axial coupling. As such, H-37 is in an axial orientation.

It was further found from the NOESY data of Product Gh-2603-2 that: δ 3.40 (H-4) was correlated not only with δ 2.08 (H-37), but also with δ 1.77 (H₁-3) and δ 1.71 (H₂-3); δ 1.77 (H₁-3) was correlated with δ 1.30 (H-19); δ 2.08 (H-37) was correlated with δ 1.77 (H₁-3) and δ 1.52 (H₂-20); and δ 3.40 (H-4) was correlated with δ 1.68 (H-29). Since δ 3.40 (H-4) was correlated with δ 1.68 (H-29), C-2 was in a R configuration. The monoterpene moiety of Product Gh-2603-2 was determined to have a rigid chair conformation, in which an 1,3-diaxial interaction exists amongst H-37, H-3, and H-20; the methyl proton (H-19) attached to C-2 and the isopropenyl group attached to C-37 were in an equatorial orientation, so that the stereostructure of Product Gh-2603-2 in this part has a 2R,4R,37S configuration.

Based on the above information, Product Gh-2603-2 was identified to be a known compound having the following chemical structure, i.e., gambogellic acid:

12. Product Gh-2603-1:

Product Gh-2603-1, which was purified from eluate 26 of fraction 3, was determined to have the following properties:

Yellow powder; mp 115˜120° C.

EIMS m/z (relative intensity): 628 [M]⁺ (92), 600 (100), 545 (68), 517 (49), 474 (98), 473 (80), 459 (17), 431 (25), 417 (13), 391 (28), 355 (24), 349 (18), 295 (11), 253 (12), 245 (13), 215 (16), 189 (7), 69 (15).

¹H-NMR (600 MHz, CDCl₃): δ 12.68 (1H, s, OH-6), 7.48 (1H, d, J=6.9 Hz, H-10), 5.99 (1H, dt, J=8.0, 1.3 Hz, H-27), 5.00 (1H, br t, J=6.7 Hz, H-32), 4.52 (1H, s, H₁-40), 4.26 (1H, s, H₂-40), 3.50 (1H, br s, H-4), 3.44 (1H, dd, J=6.8, 4.5 Hz, H-11), 3.31 (1H, dd, J=14.6, 8.2 Hz, H₁-31), 3.20 (1H, br dd, J=14.5, 3.8 Hz, H₂-31), 3.01 (1H, dd, J=16.5, 7.6 Hz, H₁-26), 2.84 (1H, ddd, J=16.6, 7.1, 1.4 Hz, H₂-26), 2.46 (1H, d, J=9.4 Hz, H-22), 2.29 (1H, dd, J=13.5, 4.6 Hz, H₁-21), 2.13 (1H, br d, J=12.4 Hz, H-37), 1.92 (1H, br dd, J=13.8, 2.0 Hz, H₁-20), 1.86 (1H, dd, J=6.6, 2.7 Hz, H₁-3), 1.84 (3H, s, H-39), 1.70 (1H, m, H₂-3), 1.695 (3H, s, H-34), 1.69 (6H, s, H-25, H-29), 1.61 (3H, s, H-35), 1.54 (1H, dt, J=13.5, 5.2 Hz, H₂-20), 1.36 (2H, m, H-36), 1.34 (1H, m, H₂-21), 1.33 (3H, s, H-19), 1.27 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 203.23 (C-12), 178.53 (C-8), 170.69 (C-30), 164.50 (C-18), 160.92 (C-6), 155.39 (C-16), 147.30 (C-38), 137.10 (C-27), 134.59 (C-10), 133.70 (C-9), 131.11 (C-33), 128.00 (C-28), 122.59 (C-32), 109.28 (C-40), 106.34 (C-17), 104.24 (C-5), 99.48 (C-7), 90.48 (C-14), 83.90 (C-23), 83.61 (C-13), 77.09 (C-2), 49.13 (C-22), 48.32 (C-37), 46.74 (C-11), 39.33 (C-20), 37.13 (C-3), 29.89 (C-25), 29.50 (C-26), 29.09 (C-4), 28.95 (C-24), 28.52 (C-19), 25.69 (C-35), 25.41 (C-21), 22.93 (C-39), 22.69 (C-36), 21.90 (C-31), 20.56 (C-29), 18.16 (C-34).

The EIMS data of product Gh-2603-1 show a molecular ion peak [M]⁺ at m/z 628, which reveals that the fragmentation pattern of Product Gh-2603-1 is identical to that of Product Gh-2603-2 (i.e., gambogellic acid). Besides, the ¹H-NMR and ¹³C-NMR data of Product Gh-2603-1 are generally similar to those of Product Gh-2603-2.

The ¹H-NMR data of Product Gh-2603-1 show that the side chain connected to C-13 has a proton signal different from that observed in a corresponding site of Product Gh-2603-2. That is, in Product Gh-2603-2 the methylene proton in the 2-methyl-2-butenoic acid has a simple doublet signal of δ 2.94 (2H, d, J=7.5 Hz, H-26), whereas in Product Gh-2603-1 the methylene proton in the 2-methyl-2-butenoic acid has signals of δ 3.01 (1H, dd, J=16.5, 7.6 Hz, H₁-26) and δ 2.84 (1H, ddd, J=16.6, 7.1, 1.4 Hz, H₂-26). In the structure of gambogellic acid (Product Gh-2603-2) wherein C-2 is in a R configuration, the methylene group (C-26) is capable of free rotation. If C-2 is in a S configuration, the monoterpene p-menthene ring and the isopropenyl group containing C-2 form a steric hindrance to free rotation, thereby resulting in a nonequivalence of the two protons in the methylene group, as well as an anisotropic effect to relevant protons. Besides, the methine proton attached to the isopropenyl group, which has a signal of δ 2.13 (1H, br d, J=12.4 Hz, H-37), has a high coupling constant (J=12.4 Hz), indicating that the methine proton attached to the isopropenyl group is in an axial orientation.

The structure of Product Gh-2603-1 was further confirmed by the ¹H-¹H COSY, HMQC and HMBC analyses, in which the HMBC data of the p-menthene monoterpene show that the exo-methylene protons (δ 4.52 (H₁-40) and δ 4.26 (H₂-40)) are correlated with δ 22.93 (C-39) and δ 48.32 (C-37); the C-3 methylene proton (δ 1.86 (H₁-3)) is correlated with δ 104.24 (C-5), δ 29.09 (C-4), δ 48.32 (C-37) and δ 147.30 (C-38); and the C-20 methylene proton (δ 1.92 (H₁-20)) is correlated with δ 48.32 (C-37) and δ 29.09 (C-4). Moreover, the methyl proton (δ 1.33 (H-19)) attached to C-2 are correlated with two adjacent methylene carbons (δ 37.13 (C-3) and δ 39.33 (C-20)).

The HMBC data of Product Gh-2603-1 also show that: H-3 is correlated with C-5 in the aromatic ring, and both the isopropenyl group attached to C-37 and the methyl proton (H-19) attached to C-2 are in an equatorial orientation. Therefore, the monoterpene moiety has a rigid chair conformation.

It is further found from the NOESY data of Product Gh-2603-1 that: δ 2.13 (H-37) is correlated with δ 1.36 (H-36) and δ 1.54 (H₂-20). This indicates that a 1,3-diaxial interaction exists amongst the axial H-37 and the two axial protons (H-3 and H-20) in the methylene group adjacent to C-2. Therefore, in contrast to Product Gh-2603-2, the p-menthene in Product Gh-2603-1 is in a 2S,4S,37R configuration. In addition, the NOESY data of Product Gh-2603-1 also shows that: δ 7.48 (H-10) is correlated with δ 3.44 (H-11); δ 3.44 (H-11) is correlated with δ 2.29 (H₁-21); δ 1.34 (H₂-21) is correlated with δ 2.46 (H-22); both δ 2.29 (H₁-21) and δ 2.46 (H-22) are correlated with δ 1.27 (H-24); and δ 5.99 (H-27) is correlated with δ 1.69 (H-29). These data evidence that the sterostructure of Product Gh-2603-1 at the right-side of the r-pyrone thereof is identical to that of gambogic acid or gambogellic acid, i.e., having a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration.

Based on the above information, Product Gh-2603-1 was identified to be a known compound having the following chemical structure, i.e., “epigambogellic acid” {IUPAC nomemclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,9S,10R,13S,16aS)-3a,4,5,7,10,11,12,13-octahydro-8-hydroxy-3,3,13-trimethyl-15-(3-methyl-2-butenyl)-10-(1-methylethenyl)-7,18-dioxo-1,5:9,13-dimethano-1H,3H,9H-furo[3.4-g]oxocino[3.2-b]xanthen-1-yl]-,(2Z)—]}:

13. Product Gh-2607-B:

Product Gh-2607-B, which was purified from eluate 32 of fraction 3, was determined to have the following properties:

Yellow powder; mp 120˜125° C.

EIMS m/z (relative intensity): 628 [M]⁺ (33), 600 (17), 545 (100), 517 (23), 499 (4), 474 (14), 431 (5), 389 (8), 355 (7), 347 (6), 245 (5), 215 (9), 189 (3), 69 (4); HREIMS [M]⁺ m/z: 628.3034; calculated for C₃₈H₄₄O₈, 628.3036.

¹H-NMR (600 MHz, CDCl₃): δ 12.57 (1H, s, OH-6), 7.50 (1H, d, J=6.9 Hz, H-10), 5.86 (1H, dt, J=7.6, 1.2 Hz, H-27), 5.10 (1H, br t, J=7.0 Hz, H-32), 3.46 (1H, dd, J=6.8, 4.5 Hz, H-11), 3.28 (1H, dd, J=14.7, 8.5 Hz, H₁-31), 3.15 (1H, m, H₁-26), 3.12 (1H, m, H₂-31), 2.95 (1H, d, J=9.6 Hz, H-3), 2.91 (1H, ddd, J=15.9, 6.9, 1.4 Hz, H₂-26), 2.50 (1H, d, J=9.3 Hz, H-22), 2.42 (1H, dd, J=9.5, 7.4 Hz, H-4), 2.31 (1H, m, H-37), 2.29 m, H₁-21), 1.74 (1H, m, H₁-20), 1.71 (3H, s, H-34), 1.69 (3H, s, H-25), 1.67 (3H, s, H-29), 1.60 (3H, s, H-35), 1.60 (1H, m, H₁-36), 1.53 (1H, m, H₂-20), 1.49 (1H, m, H₂-36), 1.36 (1H, m, H₂-21), 1.30 (3H, s, H-40), 1.28 (3H, s, H-19), 1.27 (3H, s, H-24), 0.71 (3H, s, H-39).

¹³C-NMR (150 MHz, CDCl₃): δ 203.71 (C-12), 178.89 (C-8), 171.22 (C-30), 161.53 (C-18), 161.17 (C-6), 155.04 (C-16), 137.79 (C-27), 134.63 (C-10), 133.88 (C-9), 130.85 (C-33), 128.20 (C-28), 122.37 (C-32), 108.88 (C-17), 105.32 (C-5), 100.38 (C-7), 90.33 (C-14), 85.18 (C-2), 84.18 (C-23), 83.86 (C-13), 48.94 (C-22), 46.81 (C-11), 46.23 (C-37), 38.81 (C-38), 38.58 (C-20), 36.93 (C-4), 35.01 (C-3), 33.45 (C-40), 29.91 (C-25), 29.25 (C-26), 28.93 (C-24), 27.35 (C-19), 25.74 (C-35), 25.61 (C-36), 25.32 (C-21), 21.83 (C-31), 20.78 (C-29), 18.19 (C-34), 17.68 (C-39).

The EIMS data of Product Gh-2607-B show a molecular ion peak [M]⁺ at m/z 628 and the HREIMS data of Product Gh-2607-B show a molecular ion peak [M]⁺ at m/z 628.3034, indicating that Product Gh-2607-B has a molecular formula identical to those of the above-described compounds gambogic acid and gambogellic acid as well as their epimers, i.e., C₃₈H₄₄O₈.

The ¹H-NMR and ¹³C-NMR data of Product Gh-2607-B show that Product Gh-2607-B does not have a disubstituted double bond in the pyran ring thereof, nor does it have an isopropenyl group having a terminal double bond.

As further confirmed by the ¹H-¹H COSY, HMQC and HMBC analyses, Product Gh-2607-B is structurally similar to gambogellic acid except for at the monoterpene moiety. As compared to gambogellic acid, Product Gh-2607-B was found to have one less double bond. Product Gh-2607-B was therefore presumed to have one more ring than gambogellic acid.

The ¹H-¹H COSY data of Product Gh-2607-B shows that: a methine proton having a doublet signal (δ 2.95 (1H, d, J=9.6 Hz, H-3)) is coupled to only another methine proton (δ 2.42 (1H, dd, J=9.5, 7.4 Hz, H-4)), which is further coupled to a further methine proton (δ 2.31 (1H, m, H-37)); the methine proton (δ 2.31 (1H, m, H-37)) is coupled to two methylene protons of C-36 (δ 1.60 (1H, m, H₁-36) and δ 1.49 (1H, m, H₂-36)); and a further methylene proton (δ 1.74 (1H, m, H₁-20)) is coupled to the two methylene protons of C-36 (δ 1.60 (1H, m, H₁-36) and δ 1.49 (1H, m, H₂-36)), evidencing that the monoterpene moiety of Product Gh-2607-B still has two adjacent methylene groups (C-36 (δ 25.61) and C-20 (δ 38.58)) and three adjacent methine groups (C-3 (δ 35.01), C-4 (δ 36.93), and C-37 (δ 46.23)]). The methine group (C-3) of Product Gh-2607-B is a transformation of the methylene group (C-3) of gambogellic acid, and said transformation is presumed to be caused by forming a bond between C-3 and C-38 to replace a terminal double bond between C-38 and C-40, thereby resulting in the formation of a pinane-type monoterpene structure, which includes a cyclobutane, a gem-dimethyl group (C-39 (δ 17.68) and C-40 (δ 33.45)), an oxygen-bearing quaternary carbon (C-2 (δ 85.18)), and a tertiary methyl group (C-19 (δ 27.35)) attached to the oxygen-bearing quaternary carbon.

The HMBC data of Product Gh-2607-B show that: in addition to being correlated with an aromatic carbon δ 105.32 (C-5), δ 161.17 (C-6) and δ 161.53 (C-18), δ 2.95 (H-3) is correlated with δ 85.18 (C-2), δ 46.23 (C-37), δ 38.81 (C-38), δ 38.58 (C-20), δ 36.93 (C-4), δ 33.45 (C-40), and δ 17.68 (C-39); δ 2.42 (H-4) is correlated with δ 105.32 (C-5), δ 85.18 (C-2), δ 38.81 (C-38), δ 35.01 (C-3), δ 27.35 (C-19) and δ 25.61 (C-36); and δ 2.31 (H-37) is correlated with δ 85.18 (C-2), δ 38.81 (C-38), δ 35.01 (C-3), δ 36.93 (C-4), and δ 33.45 (C-40). It can be known from the above HMBC data that: in the pinane-type monoterpene structure of Product Gh-2607-B, C-2 is connected to C-18 of an aromatic ring via an ether bond; C-4 is connected to C-5; and the methyl group (C-19) attached to C-2 is in an equatorial orientation.

It is further found from the NOESY data of Product Gh-2607-B that: δ 2.95 (H-3) is correlated with δ 2.42 (H-4), δ 1.28 (H-19) and δ 1.30 (H-40); δ 2.42 (H-4) is correlated with δ 2.31 (H-37) and δ 1.30 (H-40); δ 2.31 (H-37) is correlated with δ 1.30 (H-40); δ 0.71 (H-39) is correlated with δ 1.30 (H-40), δ 1.28 (H-19), δ 1.74 (H₁-20) and δ 1.53 (H₂-20); and δ 1.67 (H-29) is correlated with δ 5.86 (H-27), but there is no cross peak between δ 1.67 (H-29), δ 2.42 (H-4) and δ 2.31 (H-37), indicating that C-2 is in an R configuration; the methyl group (C-19) is in a α-equatorial orientation; and in the pinane structure, the three methine protons H-3, H-4 and H-37 in the cyclobutane ring are in cis-relationship such that the cyclobutane ring is in a 3S,4S,37R configuration.

The NOESY data of Product Gh-2607-B also reveal that: δ 7.50 (H-10) is correlated with δ 3.46 (H-11); δ 3.46 (H-11) is correlated with δ 2.29 (H₁-21); δ 1.36 (H₂-21) is correlated with δ 2.50 (H-22); and δ 2.50 (H-22) is correlated with δ 1.69 (H-25), evidencing that the stereostructure of Product Gh-2607-B in this part has a 11S,13R,14S,22S configuration, which includes H-27 and a carboxyl group (C-30) in a trans-relationship inasmuch as δ 1.67 (H-29) is correlated with δ 5.86 (H-27), and a double bond Δ^(27,28) in a Z configuration.

Based on the above information, Product Gh-2607-B is identified to be a new compound having the following chemical structure:

Product Gh-2607-B is identified by the name “formoxanthone B” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,9S,10S,12R,15R,18aS)-3a,4,5,7,12,13,14,15-octahydro-8-hydroxy-3,3,11,11,15-pentamethyl-17-(3-methyl-2-butenyl)-7,19-dioxo-1,5-methano-1H,3H,9H-furo[3.4-g]-16-oxa-tricyclo[4.4.0.0^(9,12)]decano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

14. Product Gh-2607-1A:

Product Gh-2607-1A, which was purified from eluate 14 of fraction 3, was determined to have the following properties:

Yellow powder; mp 146˜151° C.

EIMS m/z (relative intensity): 628 [M]⁺ (27), 601 (13), 545 (100), 517 (20), 473 (12), 389 (8), 355 (7), 347 (7), 245 (10), 215 (18), 189 (8), 69 (11); HREIMS [M⁺] m/z: 628.3046; calculated for C₃₈H₄₄O₈, 628.3036.

¹H-NMR (600 MHz, CDCl₃): δ 12.55 (1H, s, OH-6), 7.49 (1H, d, J=6.9 Hz, H-10), 5.87 (1H, t, J=7.3 Hz, H-27), 5.00 (1H, br t, J=6.3 Hz, H-32), 3.46 (1H, t, J=5.6 Hz, H-11), 3.27 (1H, dd, J=14.3, 8.6 Hz, H₁-31), 3.17 (1H, dd, J=15.9, 8.4 Hz, H₁-26), 3.10 (1H, br dd, J=13.9, 4.4 Hz, H₂-31), 2.93 (1H, m, H-3), 2.92 (1H, m, H₂-26), 2.49 (1H, d, J=9.3 Hz, H-22), 2.40 (1H, t, J=8.4 Hz, H-4), 2.30 (1H, m, H-37), 2.28 (1H, m, H₁-21), 1.72 (1H, m, H₁-20), 1.70 (3H, s, H-34), 1.68 (3H, s, H-25), 1.66 (3H, s, H-29), 1.60 (3H, s, H-35), 1.58 (1H, m, H₁-36), 1.52 (1H, m, H₂-20), 1.50 (1H, m, H₂-36), 1.35 (1H, dd, J=13.3, 9.6 Hz, H₂-21), 1.28 (3H, s, H-19), 1.27 (6H, s, H-24, H-40), 0.69 (3H, s, H-39).

¹³C-NMR (150 MHz, CDCl₃): δ 203.75 (C-12), 178.86 (C-8), 171.59 (C-30), 161.51 (C-18), 161.15 (C-6), 155.01 (C-16), 138.12 (C-27), 134.58 (C-10), 133.85 (C-9), 130.79 (C-33), 128.07 (C-28), 122.35 (C-32), 108.85 (C-17), 105.28 (C-5), 100.34 (C-7), 90.32 (C-14), 85.12 (C-2), 84.20 (C-23), 83.80 (C-13), 48.93 (C-22), 46.79 (C-11), 46.19 (C-37), 38.77 (C-38), 38.53 (C-20), 36.90 (C-4), 34.97 (C-3), 33.41 (C-40), 29.90 (C-25), 29.19 (C-26), 28.91 (C-24), 27.31 (C-19), 25.73 (C-35), 25.59 (C-36), 25.29 (C-21), 21.80 (C-31), 20.77 (C-29), 18.16 (C-34), 17.65 (C-39).

The EIMS data of Product Gh-2607-1A show a molecular ion peak [M]⁺ at m/z 628 and the HREIMS data of Product Gh-2607-1A show a molecular ion peak [M]⁺ at m/z 628.3046, indicating that Product Gh-2607-1A has a molecular formula identical to those of the above-described compounds gambogic acid and gambogellic acid as well as their epimers, i.e., C₃₈H₄₄O₈.

The ¹H-NMR and ¹³C-NMR data of Product Gh-2607-1A show that Product Gh-2607-1A does not have a cis disubstituted double bond in the pyran ring thereof, nor does it have an isopropenyl group having a terminal double bond.

As further confirmed by the ¹H-¹H COSY, HMQC and HMBC analyses, Product Gh-2607-1A is structurally similar to gambogellic acid except for at the monoterpene moiety. As compared to gambogellic acid, Product Gh-2607-1A was found to have one less double bond. Product Gh-2607-1A was therefore presumed to have one more ring than gambogellic acid.

The ¹H-¹H COSY data of product Gh-2607-1A show that: a methine proton (δ 2.93 (1H, m, H-3)) is coupled to another methine proton (δ 2.40 (1H, t, J=8.4 Hz, H-4)); the methine proton δ 2.40 is coupled to a further methine proton (δ 2.30 (1H, m, H-37)); the methine proton δ 2.30 is coupled to one methylene proton (δ 1.50 (1H, m, H₂-36)) of C-36; and the other methylene proton (δ 1.58 (1H, m, H₁-36)) of C-36 is coupled to another methylene proton (δ 1.72 (1H, m, H₁-20)), evidencing that the monoterpene moiety of Product Gh-2607-1A has two adjacent methylene groups (C-20 (δ 38.53) and C-36 (δ 25.59)) and three adjacent methine groups (C-37 (δ 46.19), C-4 (δ 36.90) and C-3 (δ 34.97)). The methine group (C-3) of Product Gh-2607-1A is a transformation of the methylene group (C-3) of gambogellic acid, and said transformation is presumed to be caused by forming a bond between C-3 and C-38 to replace a terminal double bond between C-38 and C-40, thereby resulting in the formation of a pinane-type monoterpene structure, which includes a cyclobutane, a gem-dimethyl group (C-39 (δ 17.65) and C-40 (δ 33.41)), an oxygen-bearing quaternary carbon (C-2 (δ 85.12)), and a tertiary methyl group (C-19 (δ 27.31)) attached to the oxygen-bearing quaternary carbon.

The HMBC data of Product Gh-2607-1A show that: in addition to being correlated with aromatic ring carbons δ 105.28 (C-5), δ 161.15 (C-6) and δ 161.51 (C-18), δ 2.93 (H-3) is correlated with δ 85.12 (C-2), δ 46.19 (C-37), δ 38.77 (C-38), δ 38.53 (C-20), δ 36.90 (C-4), δ 33.41 (C-40) and δ 17.65 (C-39); δ 2.40 (H-4) is correlated with δ 105.28 (C-5), δ 38.77 (C-38), δ 34.97 (C-3), δ 46.19 (C-37), δ 25.59 (C-36), δ 38.53 (C-20) and δ 27.31 (C-19); and δ 2.30 (H-37) is correlated with δ 105.28 (C-5), δ 85.12 (C-2), δ 38.77 (C-38), δ 34.97 (C-3), δ 36.90 (C-4), δ 38.53 (C-20), δ 25.59 (C-36) and δ 33.41 (C-40). It can be known from the above HMBC data that in the pinane-type monoterpene structure of Product Gh-2607-1A, C-2 is connected to C-18 of an aromatic ring via an ether bond; C-4 is connected to C-5; and the methyl group (C-19) attached to C-2 is in an equatorial orientation.

The NOESY data of Product Gh-2607-1A show that: δ 7.49 (H-10) is correlated with δ 3.46 (H-11); δ 3.46 (H-11) is correlated with δ 2.28 (H₁-21); δ 1.35 (H₂-21) is correlated with δ 2.49 (H-22); δ 2.49 (H-22) is correlated with δ 1.68 (H-25); and δ 5.87 (H-27) is correlated with δ 1.66 (H-29), evidencing that the stereostructure of Product Gh-2607-1A in this part has a 11S,13R,14S,22S configuration, which includes H-27 and a carboxyl group (C-30) in a trans-relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, δ 2.93 (H-3) is correlated with δ 2.40 (H-4), δ 1.28 (H-19) and δ 1.27 (H-40); δ 2.40 (H-4) is correlated with δ 2.30 (H-37), δ 1.27 (H-40) and δ 1.66 (H-29); δ 2.30 (H-37) is correlated with δ 1.66 (H-29) and δ 1.70 (H-34); and δ 1.50 (H₂-36) is correlated with δ 1.66 (H-29). It can therefore be known that C-2 is in a S configuration; and in the pinane structure, the three methine protons H-3, H-4 and H-37 in the cyclobutane ring are in cis-relationship such that the cyclobutane ring is in a 3S,4S,37R configuration. The NOESY data also reveal that: both δ 3.27 (H₁-31) and δ 3.10 (H₂-31) are correlated with δ 1.66 (H-29); both δ 3.17 (H₁-26) and δ 2.92 (H₂-26) are correlated with δ 1.70 (H-34); and δ 0.69 (H-39) is correlated with δ 1.72 (H₁-20), δ 1.28 (H-19) and δ 1.27 (H-40).

Based on the above information, Product Gh-2607-1A is identified to be a new compound having the following chemical structure:

Product Gh-2607-1A is identified by the name “epiformoxanthone B” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,9R,10R,12S,15S,18aS)-3a,4,5,7,12,13,14,15-octahydro-8-hydroxy-3,3,11,11,15-pentamethyl-17-(3-methyl-2-butenyl)-7,19-dioxo-1,5-methano-1H,3H,9H-furo[3.4-g]-16-oxa-tricyclo[4.4.0.0^(9,12)]decano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

15. Product Gh-2508:

Product Gh-2508, which was purified from eluate 25 of fraction 3, was determined to have the following properties:

Yellow powder; mp 113˜118° C.

EIMS m/z (relative intensity): 628 [M]⁺ (71), 600 (100), 575 (14), 545 (52), 517 (68), 501 (12), 473 (96), 459 (12), 431 (26), 417 (18), 389 (29), 355 (64), 349 (26), 307 (12), 295 (22), 253 (24), 245 (29), 214.9 (26), 189 (17), 105 (15), 91 (18), 69 (35).

¹H-NMR (600 MHz, CDCl₃): δ 12.57 (1H, s, OH-6), 7.50 (1H, d, J=6.9 Hz, H-10), 5.79 (1H, dd, J=16.0, 7.2 Hz, H-27), 5.30 (1H, d, J=16.0 Hz, H-26), 5.14 (1H, br t, J=6.9 Hz, H-32), 4.57 (1H, s, H₁-40), 4.23 (1H, s, H₂-40), 3.50 (1H, br d, J=2.8 Hz, H-4), 3.43 (1H, dd, J=6.8, 4.4 Hz, H-11), 3.23 (2H, m, H-31), 2.90 (1H, dq, J=7.2, 7.1 Hz, H-28), 2.56 (1H, d, J=9.3 Hz, H-22), 2.29 (1H, dd, J=13.4, 4.6 Hz, H₁-21), 2.16 (1H, br d, J=12.5 Hz, H-37), 1.94 (1H, br d, J=12.9 Hz, H₁-20), 1.89 (1H, m, H₁-3), 1.86 (3H, s, H-39), 1.75 (1H, m, H₂-3), 1.73 (6H, s, H-25, H-34), 1.65 (3H, s, H-35), 1.56 (1H, dt, J=13.4, 5.0 Hz, H₂-20), 1.42 (1H, m, H₂-21), 1.38 (3H, s, H-19), 1.36 (2H, m, H-36), 1.27 (3H, s, H-24), 0.90 (3H, d, J=7.1 Hz, H-29).

¹³C-NMR (150 MHz, CDCl₃): δ 203.38 (C-12), 179.21 (C-8), 177.35 (C-30), 164.29 (C-18), 160.61 (C-6), 155.79 (C-16), 147.66 (C-38), 134.54 (C-9, C-10), 134.33 (C-27), 131.17 (C-33), 123.80 (C-26), 122.45 (C-32), 108.83 (C-40), 106.65 (C-17), 104.18 (C-5), 100.11 (C-7), 91.46 (C-14), 84.76 (C-13), 84.13 (C-23), 77.07 (C-2), 48.27 (C-22), 48.13 (C-37), 47.06 (C-11), 41.74 (C-28), 39.31 (C-20), 36.92 (C-3), 30.03 (C-25), 28.94 (C-4), 28.73 (C-24), 28.50 (C-19), 25.74 (C-35), 25.51 (C-21), 22.98 (C-39), 22.74 (C-36), 21.94 (C-31), 18.18 (C-34), 15.80 (C-29).

The EIMS data of Product Gh-2508 show a molecular ion peak [M]⁺ at m/z 628, which reveals that the fragmentation pattern of Product Gh-2508 is identical to that of Product Gh-2603-2 (i.e., gambogellic acid). Besides, the ¹H-NMR and ¹³C-NMR data of Product Gh-2508 are generally similar to those of Product Gh-2603-2.

The ¹H-NMR and ¹³C-NMR data of Product Gh-2508 show that the side chain connected to C-13 and containing a carboxyl group is different from that of Product Gh-2603-2; the disubstituted double bond Δ^(26,27) (δ 5.79 (1H, dd, J=16.0, 7.2 Hz, H-27) and δ 134.33 (C-27), and δ 5.30 (1H, d, J=16.0 Hz, H-26) and δ 123.80 (C-26)) exists instead of the trisubstituted double bond Δ^(27,28) and the methylene group (C-26) in Product Gh-2603-2. Besides, since two coupled olefinic protons (H-26 and H-27) have a coupling constant (J) of 16.0 Hz, the double bond Δ^(26,27) is a trans double bond (namely, in an E-configuration). It can be known from a doublet signal of δ 0.90 (3H, d, J=7.1 Hz, H-29) that C-29 represents a secondary methyl group and H-29 is coupled to a methine proton (δ 2.90 (1H, dq, J=7.2, 7.1 Hz, H-28)). Besides, a methine group (δ 2.90 (H-28) and δ 41.74 (C-28)) is adjacent to a carboxyl carbon (δ 177.35 (C-30)), indicating that the carboxyl carbon is not an α/β-unsaturated carbonyl carbon.

The HMBC data of Product Gh-2508 show that: δ 5.79 (H-27) is correlated with δ 177.35 (C-30), δ 15.80 (C-29), δ 41.74 (C-28) and δ 84.76 (C-13); δ 5.30 (H-26) is correlated with δ 177.35 (C-30), δ 41.74 (C-28), δ 134.33 (C-27) and δ 84.76 (C-13); δ 2.90 (H-28) is correlated with δ 177.35 (C-30), δ 15.80 (C-29), δ 134.33 (C-27) and δ 123.80 (C-26); and δ 0.90 (H-29) is correlated with δ 177.35 (C-30) and δ 134.33 (C-27), evidencing that the side chain connected to C-13 is (E)-2-methyl-3-butenoic acid.

The NOESY data of Product Gh-2508 show that δ 7.50 (H-10) is correlated with δ 3.43 (H-11); δ 3.43 (H-11) is correlated with δ 2.29 (H₁-21); and δ 2.56 (H-22) is correlated with δ 1.42 (H₂-21) and δ 1.27 (H-24), evidencing that the stereostructure of Product Gh-2508 in this part is identical to that of gambogic acid or gambogellic acid, i.e., in a 11S,13R,14S,22S configuration. Besides, 60.90 (H-29) is correlated with not only δ 5.79 (H-27) and δ 5.30 (H-26) but also the adjacent δ 2.90 (H-28).

As further confirmed by the ¹H-¹H COSY, HMQC and HMBC analyses, the monoterpene moiety of Product Gh-2508 is identical to that of Product Gh-2603-2. The signal of the methine proton (δ 2.16 (1H, br d, J=12.5 Hz, H-37)) attached to the isopropenyl group reveals that the methine proton attached to the isopropenyl group and a vicinal proton have a relatively high vicinal coupling constant (J=12.5 Hz) and, hence, they are in an axial-axial coupling relationship. As such, H-37 is in an axial orientation, and C-37 is in an S-configuration.

The NOESY data of Product Gh-2508 show that: δ 3.50 (H-4) is correlated with not only δ 2.16 (H-37) but also δ 1.89 (H₁-3) and δ 1.75 (H₂-3); δ 1.89 (H₁-3) is correlated with δ 1.38 (H-19); and an axial hydrogen δ 2.16 (H-37) is correlated with δ 1.89 (H₁-3) and δ 1.56 (H₂-20), evidencing that the monoterpene ring has a chair conformation with 1,3-diaxial interaction, and both the methyl proton (H-19) connected to C-2 and the isopropenyl group connected to C-37 are in an equatorial orientation. Inasmuch as no nuclear Overhauser effect (NOE) is present amongst the methyl proton (δ 0.90 (H-29)) on the side chain attached to C-13 and the exo-methylene protons (δ 4.57 (H₁-40) and δ 4.23 (H₂-40)) of the isopropenyl group in the monoterpene moiety, C-2 is presumed to be in an R configuration. As such, the monoterpene moiety is determined to be in a 2R,4R,37S configuration.

Based on the above information, Product Gh-2508 is identified to be a new compound having the following chemical structure:

Product Gh-2508 is identified by the name “β-gambogellic acid” {IUPAC nomenclature: [3-butenoic acid, 2-methyl-4-[(1R,3aS,5S,9R,10S,13R,16aS)-3a,4,5,7,10,11,12,13-octahydro-8-hydroxy-3,3,13-trimethyl-15-(3-methyl-2-butenyl)-10-(1-methylethenyl)-7,18-dioxo-1,5:9,13-dimethano-1H,3H,9H-furo[3.4-g]oxocino[3.2-b]xanthen-1-yl]-,(3E)-]}.

16. Product Gh-2507:

Product Gh-2507, which was purified from eluate 23 of fraction 2, was determined to have the following properties:

Yellow needles; mp 148˜152° C.

EIMS m/z (relative intensity): 628 [M]⁺ (48), 600 (100), 585 (9), 545 (41), 517 (69), 510 (12), 473 (93), 431 (24), 417 (18), 389 (28), 355 (68), 347 (25), 307 (11), 299 (24), 295 (20), 253 (22), 245 (28), 214.9 (22), 199 (18), 189 (15), 105 (12), 91 (17), 69 (25).

¹H-NMR (600 MHz, CDCl₃): δ 12.61 (1H, s, OH-6), 7.48 (1H, d, J=6.9 Hz, H-10), 6.06 (1H, dd, J=15.7, 7.2 Hz, H-27), 5.15 (1H, d, J=15.7 Hz, H-26), 5.11 (1H, br t, J=6.9 Hz, H-32), 4.56 (1H, s, H₁-40), 4.20 (1H, s, H₂-40), 3.54 (1H, br d, J=2.7 Hz, H-4), 3.44 (1H, dd, J=6.8, 4.5 Hz, H-11), 3.25 (1H, dd, J=14.4, 8.1 Hz, H₁-31), 3.17 (1H, dd, J=14.4, 5.6 Hz, H₂-31), 2.90 (1H, dq, J=7.2, 7.1 Hz, H-28), 2.56 (1H, d, J=9.3 Hz, H-22), 2.30 (1H, dd, J=13.5, 4.7 Hz, H₁-21), 2.16 (1H, br d, J=12.4 Hz, H-37), 1.97 (1H, br d, J=12.8 Hz, H₁-20), 1.88 (1H, m, H₁-3), 1.87 (3H, s, H-39), 1.74 (1H, m, H₂-3), 1.72 (3H, s, H-25), 1.71 (3H, s, H-34), 1.64 (3H, s, H-35), 1.55 (1H, dt, J=13.5, 4.9 Hz, H₂-20), 1.44 (1H, m, H₂-21), 1.43 (1H, m, H₁-36), 1.36 (3H, s, H-19), 1.32 (1H, H₂-36), 1.27 (3H, s, H-24), 0.92 (3H, d, J=7.0 Hz, H-29).

¹³C-NMR (150 MHz, CDCl₃): δ 203.53 (C-12), 179.16 (C-8), 177.27 (C-30), 164.37 (C-18), 160.73 (C-6), 156.10 (C-16), 148.04 (C-38), 134.80 (C-10), 134.65 (C-27), 134.52 (C-9), 131.20 (C-33), 122.91 (C-26), 122.39 (C-32), 108.71 (C-40), 106.53 (C-17), 104.14 (C-5), 99.93 (C-7), 90.92 (C-14), 84.66 (C-13), 84.10 (C-23), 77.16 (C-2), 48.49 (C-22), 48.15 (C-37), 47.03 (C-11), 42.00 (C-28), 39.21 (C-20), 37.04 (C-3), 29.96 (C-25), 28.93 (C-4), 28.76 (C-24), 28.53 (C-19), 25.77 (C-35), 25.35 (C-21), 22.94 (C-39), 22.59 (C-36), 22.01 (C-31), 18.15 (C-34), 15.92 (C-29).

The EIMS data of Product Gh-2507 show a molecular ion peak [M]⁺ at m/z 628, which is identical to those of Products Gh-2603-1 (i.e., epigambogellic acid) and Gh-2603-2 (i.e., gambogellic acid). Besides, the ¹H-NMR and ¹³C-NMR data of Product Gh-2507 are generally similar to those of Product Gh-2603-1.

The ¹H-NMR and ¹³C-NMR data of Product Gh-2507 show that a side chain connected to C-13 and having a carboxyl group differs from that of Product Gh-2603-1; a disubstituted double bond Δ^(26,27) (δ 5.15 (1H, d, J=15.7 Hz, H-26) and δ 122.91 (C-26), and δ 6.06 (1H, dd, J=15.7, 7.2 Hz, H-27) and δ 134.65 (C-27)] exists instead of the trisubstituted double bond Δ^(27,28) and the methylene group (C-26) in Product Gh-2603-1; and two coupled olefinic protons (H-26 and H-27) have a coupling constant (J) of 15.7 Hz. As such, the disubstituted double bond Δ^(26,27) is a trans double bond (namely, in an E-configuration). It can be known from a doublet signal of δ 0.92 (3H, d, J=7.0 Hz, H-29) that C-29 represents a secondary methyl group, and the proton (H-29) of the secondary methyl group is coupled to a methine proton (δ 2.90 (1H, dq, J=7.2, 7.1 Hz, H-28)). In addition, since the methine group (δ 2.90 (H-28) and δ 42.00 (C-28)) is adjacent to a carboxyl carbon (δ 177.27 (C-30)), the carboxyl carbon is not an α/β-unsaturated carbonyl carbon.

The HMBC data of Product Gh-2507 show that: δ 6.06 (H-27) is correlated with δ 177.27 (C-30), δ 15.92 (C-29), δ 42.00 (C-28) and δ 84.66 (C-13); δ 5.15 (H-26) is correlated with δ 42.00 (C-28), δ 134.65 (C-27), δ 84.66 (C-13) and δ 203.53 (C-12); δ 2.90 (H-28) is correlated with δ 177.27 (C-30), δ 15.92 (C-29), δ 134.65 (C-27) and δ 122.91 (C-26); and δ 0.92 (H-29) is correlated with δ 177.27 (C-30), δ 42.00 (C-28) and δ 134.65 (C-27), evidencing that the side chain attached to C-13 is (E)-2-methyl-3-butenoic acid.

The NOESY data of Product Gh-2507 show that: δ 7.48 (H-10) is correlated with δ 3.44 (H-11); δ 3.44 (H-11) is correlated with δ 2.30 (H₁-21) and δ 1.44 (H₂-21); δ 1.44 (H₂-21) is correlated with δ 2.56 (H-22); and δ 2.56 (H-22) is correlated with δ 1.72 (H-25), evidencing that the stereostructure of Product Gh-2507 in this part is identical to that of gambogic acid, gambogellic acid and epigambogellic acid, i.e., in a 11S,13R,14S,22S configuration. Besides, δ 0.92 (H-29) is correlated with δ 2.90 (H-28), δ 6.06 (H-27), δ 5.15 (H-26), and δ 4.20 (H₂-40). The methyl proton (H-29) is correlated with the exo-methylene protons (δ 4.56 (H₁-40) and δ 4.20 (H₂-40)] of the isopropenyl group in the monoterpene moiety. As such, C-2 is presumed to be in a S-configuration. If C-2 is in a R configuration, no cross peaks would appear.

As further confirmed by the ¹H-¹H COSY, HMQC and HMBC analyses, the monoterpene moiety of Product Gh-2507 is identical to that of Product Gh-2603-1. The signal of the methine proton (δ 2.16 (1H, br d, J=12.4 Hz, H-37)) attached to the isopropenyl group reveals that the methine proton attached to the isopropenyl group and a vicinal proton have a relatively high vicinal coupling constant (J=12.4 Hz) and, hence, they are in an axial-axial coupling relationship. As such, H-37 is in an axial orientation, and C-37 is in an R configuration.

The NOESY data of Product Gh-2507 also reveal that: δ 3.54 (H-4) is correlated with not only δ 2.16 (H-37) but also δ 1.88 (H₁-3) and δ 1.74 (H₂-3); the methylene protons (H₁-3 and H₂-3) both are correlated with δ 1.36 (H-19); and the axial hydrogen δ 2.16 (H-37) is correlated with not only δ 1.87 (H-39) but also δ 1.88 (H₁-3), δ 1.55 (H₂-20) and δ 1.43 (H₁-36), evidencing that the monoterpene ring has a chair conformation with 1,3-diaxial interaction, in which both the methyl group (C-19) connected to C-2 and the isopropenyl group connected to C-37 are in an equatorial orientation. As such, the stereostructure of the p-menthene monoterpene is in a 2S,4S,37R configuration.

Based on the above information, Product Gh-2507 is identified to be a new compound having the following chemical structure:

Product Gh-2507 is identified by the name “β-epigambogellic acid” {IUPAC nomenclature: [3-butenoic acid, 2-methyl-4-[(1R,3aS,5S,9S,10R,13S,16aS)-3a,4,5,7,10,11,12,13-octahydro-8-hydroxy-3,3,13-trimethyl-15-(3-methyl-2-butenyl)-10-(1-methylethenyl)-7,18-dioxo-1,5:9,13-dimethano-1 furo[3.4-g]oxocino[3.2-b]xanthen-1-yl]-,(3E)-]}.

17. Product Gh-2501:

Product Gh-2501, which was purified from eluate 21 of fraction 2, was determined to have the following properties:

Yellow powder; mp 100˜103° C.

EIMS m/z (relative intensity): 544 [M]⁺ (100), 529 (67), 516 (16), 501 (56), 473 (13), 435 (11), 405 (59), 389 (25), 363 (43), 349 (37), 337 (12), 307 (34), 287 (58), 259 (29), 229 (69), 215 (59), 189 (35), 147 (23), 135 (30), 105 (42), 91 (27), 83 (29), 69 (36), 55 (34).

¹H-NMR (600 MHz, CDCl₃): δ 12.70 (1H, s), 9.21 (1H, s), 7.54 (1H, d, J=7.0 Hz), 6.59 (1H, d, J=10.0 Hz), 6.37 (1H, t, J=8.5 Hz), 5.50 (1H, d, J=10.0 Hz), 5.07 (1H, t, J=8.4 Hz), 3.51 (1H, dd, J=6.9, 4.5 Hz), 3.25 (1H, dd, J=14.4, 8.1 Hz), 3.17 (1H, br dd, J=13.9, 5.9 Hz), 2.71 (1H, ddd, J=16.0, 7.5, 0.8 Hz), 2.62 (1H, ddd, J=16.0, 7.0, 0.9 Hz), 2.56 (1H, d, J=9.4 Hz), 2.34 (1H, dd, J=13.6, 4.7 Hz), 1.73 (3H, s), 1.71 (3H, s), 1.62 (3H, s), 1.43 (3H, s), 1.41 (3H, s), 1.39 (1H, m), 1.29 (3H, s), 1.28 (3H, d, J=1.2 Hz).

¹³C-NMR (150 MHz, CDCl₃): δ 203.02, 194.46, 178.84, 161.34, 157.68, 157.15, 146.51, 140.11, 135.62, 133.34, 131.98, 126.39, 121.82, 115.28, 108.07, 103.27, 100.36, 90.79, 83.98, 83.39, 78.87, 48.99, 46.85, 29.96, 28.96, 28.93, 28.39 (2C), 25.75, 25.26, 21.67, 18.16, 8.58.

According to the obtained spectral data, Product Gh-2501 was identified to be a known compound having the following chemical structure, i.e., isomorellin:

18. Product Gh-2505:

Product Gh-2505, which was purified from eluate 24 of fraction 2, was determined to have the following properties:

Yellow powder; mp 67˜70° C.

EIMS m/z (relative intensity): 630 [M]⁺ (100), 602 (19), 545 (14), 507 (36), 479 (22), 475 (18), 433 (8), 351 (27), 309 (17), 295 (38), 253 (45), 245 (16), 231 (16), 213 (13), 177 (15), 147 (8), 69 (29).

¹H-NMR (600 MHz, CDCl₃): δ 12.81 (1H, s), 7.52 (1H, d, J=6.9 Hz), 6.48 (1H, s), 5.83 (1H, t, J=7.2 Hz), 5.17 (1H, t, J=6.9 Hz), 5.06 (1H, br t, J=6.6 Hz), 5.02 (1H br t, J=6.7 Hz), 3.48 (1H, dd, J=6.6, 4.8 Hz), 3.30 (1H, m), 3.28 (2H, m), 3.24 (1H, dd, J=16.1, 7.1 Hz), 3.10 (1H, dd, J=15.7, 8.7 Hz), 2.86 (1H, ddd, J=15.9, 6.7, 1.1 Hz), 2.49 (1H, d, J=9.4 Hz), 2.30 (1H, dd, J=13.5, 4.7 Hz), 2.06 (2H, m), 2.00 (2H, m), 1.74 (3H, s), 1.71 (3H, s), 1.70 (3H, s), 1.66 (3H, s), 1.65 (3H, s), 1.64 (3H, s), 1.56 (3H, s), 1.36 (1H, dd, J=13.5, 9.5 Hz), 1.27 (3H, s).

¹³C-NMR (150 MHz, CDCl₃): δ 203.38, 179.12, 170.39, 163.62, 160.34, 155.85, 139.06, 136.95, 135.15, 133.91, 133.52, 131.88, 128.50, 123.83, 121.91, 121.35, 107.50, 106.43, 100.64, 90.41, 83.94, 83.87, 48.90, 46.88, 39.68, 29.79, 29.46, 28.92, 26.33, 25.71, 25.67, 25.21, 22.03, 21.09, 20.74, 17.98, 17.68, 16.16.

According to the obtained spectral data, Product Gh-2505 was identified to be a known compound having the following chemical structure, i.e., gambogenic acid:

19. Product Gh-2642:

Product Gh-2642, which was purified from eluate 22 of fraction 2, was determined to have the following properties:

Yellow powder; mp 157˜159° C.

EIMS m/z (relative intensity): 630 [M]⁺ (100), 602 (11), 545 (11), 533 (16), 507 (46), 479 (21), 475 (15), 433 (7), 419 (8), 381 (9), 357 (13), 351 (20), 309 (14), 295 (27), 253 (34), 245 (15), 231 (16), 213 (11), 177 (15), 147 (8), 135 (8), 105 (11), 69 (44).

¹H-NMR (600 MHz, CDCl₃): δ 12.76 (1H, s), 7.52 (1H, d, J=7.0 Hz), 6.70 (1H, br s), 6.59 (1H, t, J=7.5 Hz), 5.19 (1H, t, J=7.0 Hz), 5.10 (1H, br t, J=6.0 Hz), 5.02 (1H, br t, J=6.1 Hz), 3.47 (1H, t, J=5.6 Hz), 3.34 (2H, m), 3.31 (2H, m), 2.60 (1H, dd, J=15.7, 7.9 Hz), 2.50 (1H, m), 2.49 (1H, d, J=9.5 Hz), 2.30 (1H, dd, J=13.3, 4.4 Hz), 2.06 (2H, m), 2.02 (2H, m), 1.76 (3H, s), 1.70 (3H, s), 1.66 (6H, s), 1.62 (3H, s), 1.54 (3H, s), 1.35 (1H, dd, J=13.3, 9.5 Hz), 1.30 (3H, s), 1.25 (H, s).

¹³C-NMR (150 MHz, CDCl₃): δ 203.15, 179.02, 172.20, 163.51, 160.27, 155.87, 138.98, 136.90, 135.50, 133.72, 133.33, 131.75, 128.64, 123.81, 121.88, 121.15, 107.51, 106.63, 100.55, 90.37, 83.65, 83.49, 48.89, 46.82, 39.61, 29.80, 28.85 (2C), 26.27, 25.65, 25.60, 25.19, 21.98, 21.10, 17.93, 17.59, 16.16, 11.34.

According to the obtained spectral data, Product Gh-2642 was identified to be a known compound having the following chemical structure, i.e., isogambogenic acid:

20. Product Gh-1601-A:

Product Gh-1601-A, which was purified from eluate 20 of fraction 2, was determined to have the following properties:

Yellow powder; mp 143˜145° C.

EIMS m/z (relative intensity): 644 (72), 598 (18), 561 (100), 515 (23), 474 (35), 431 (9), 391 (10), 355 (14), 349 (7), 347 (6), 253 (6), 248 (11), 215 (11), 189 (6), 125 (4), 69 (18).

¹H-NMR (600 MHz, CDCl₃): δ 12.76 (1H, s), 7.54 (1H, d, J=6.9 Hz), 6.61 (1H, d, J=10.2 Hz), 6.31 (1H, t, J=7.2 Hz), 5.41 (1H, d, J=10.1 Hz), 5.02 (2H, br s), 4.09 (1H, d, J=13.3 Hz), 4.01 (1H, d, J=13.3 Hz), 3.49 (1H, br t, J=5.6 Hz), 3.27 (1H, dd, J=14.2, 8.0 Hz), 3.13 (1H, br dd, J=14.3, 5.2 Hz), 2.96 (2H, d, J=7.5 Hz), 2.51 (1H, d, J=9.6 Hz), 2.31 (1H, dd, J=13.4, 4.7 Hz), 2.00 (2H, m), 1.72 (1H, m), 1.70 (3H, s), 1.67 (3H, s), 1.62 (3H, s), 1.60 (3H, s), 1.58 (1H, m), 1.52 (3H, s), 1.38 (1H, m), 1.37 (3H, s), 1.26 (3H, s).

¹³C-NMR (150 MHz, CDCl₃): δ 203.04, 179.01, 169.43, 161.66, 157.50, 157.27, 139.33, 135.66, 133.20, 131.90, 131.87, 131.24, 124.80, 123.69, 121.96, 115.76, 107.75, 102.82, 100.47, 90.76, 84.25, 83.67, 81.47, 64.80, 48.92, 46.82, 41.93, 29.82, 29.14, 28.82, 27.76, 25.68, 25.65, 25.12, 22.70, 21.60, 18.13, 17.61.

According to the obtained spectral data, Product Gh-1601-A was identified to be a known compound having the following chemical structure, i.e., 30-hydroxygambogic acid:

21. Product Gh-1602:

Product Gh-1602, which was purified from eluate 18 of fraction 2, was determined to have the following properties:

Yellow powder; mp 98˜100° C.

EIMS m/z (relative intensity): 644 [M]⁺ (28), 598 (5), 561 (100), 515 (15), 474 (9), 431 (3), 389 (5), 355 (5), 347 (5), 253 (3), 245 (6), 215 (10), 189 (5), 125 (3), 69 (8).

¹H-NMR (600 MHz, CDCl₃): δ 12.73 (1H, s), 7.54 (1H, d, J=6.9 Hz), 6.60 (1H, d, J=10.1 Hz), 6.40 (1H, t, J=7.4 Hz), 5.39 (1H, d, J=10.2 Hz), 5.07 (1H, t, J=7.0 Hz), 5.01 (1H, br t, J=6.8 Hz), 4.09 (1H, d, J=13.1 Hz), 4.02 (1H, d, J=13.2 Hz), 3.46 (1H, t, J=5.6 Hz), 3.27 (1H, dd, J=14.6, 8.2 Hz), 3.12 (1H, dd, J=14.6, 5.0 Hz), 2.96 (2H, d, J=7.5 Hz), 2.50 (1H, d, J=9.3 Hz), 2.29 (1H, dd, J=13.5, 4.7 Hz), 2.04 (2H, m), 1.73 (1H, m), 1.71 (3H, s), 1.67 (3H, s), 1.64 (3H, s), 1.62 (1H, m), 1.61 (3H, s), 1.56 (3H, s), 1.36 (1H, m), 1.32 (3H, s), 1.26 (3H, s).

¹³C-NMR (150 MHz, CDCl₃): δ 203.08, 179.02, 169.57, 161.46, 157.50, 157.24, 140.20, 135.91, 133.02, 132.20, 131.62, 131.15, 124.94, 123.74, 122.04, 115.81, 107.89, 102.95, 100.50, 90.89, 84.02, 83.56, 81.21, 64.64, 48.91, 46.82, 41.67, 29.90, 29.14, 28.77, 26.91, 25.69, 25.61, 25.19, 22.73, 21.58, 18.15, 17.60.

According to the obtained spectral data, Product Gh-1602 was identified to be a known compound having the following chemical structure, i.e., 30-hydroxyepigambogic acid:

22. Product Gh-2641-1:

Product Gh-2641-1, which was purified from eluate 20 of fraction 2, was determined to have the following properties:

Yellow powder; mp 94˜98° C.

EIMS m/z (relative intensity): 646 [M]⁺ (100), 545 (18), 523 (80), 495 (28), 477 (17), 449 (16), 367 (44), 349 (20), 325 (37), 295 (41), 252.9 (49), 245 (27), 213 (32), 147 (16).

¹H-NMR (600 MHz, CDCl₃): δ 12.84 (1H, s, OH-6), 7.46 (1H, d, J=7.0 Hz, H-10), 5.30 (1H, ddd, J=12.1, 4.0, 1.4 Hz, H-27), 5.19 (1H, dt, J=7.1, 1.2 Hz, H-32), 5.04 (1H, tt, J=6.9, 1.3 Hz, H-37), 4.68 (1H, dd, J=9.8, 6.5 Hz, H-4), 3.76 (1H, dd, J=14.5, 12.1 Hz, H₁-26), 3.48 (1H, d, J=7.0, 4.2 Hz, H-11), 3.16 (2H, m, H-31), 3.13 (1H, dd, J=15.3, 6.5 Hz, H₁-3), 3.03 (1H, dd, J=15.3, 9.8 Hz, H₂-3), 2.76 (1H, ddd, J=14.5, 4.0, 2.2 Hz, H₂-26), 2.39 (1H, d, J=9.6 Hz, H-22), 2.32 (1H, dd, J=13.5, 4.5 Hz, H₁-21), 2.02 (2H, m, H-36), 1.91 (2H, m, H-20), 1.70 (3H, s, H-35), 1.64 (3H, s, H-25), 1.61 (3H, s, H-39), 1.53 (3H, s, H-40), 1.51 (3H, s, H-29), 1.43 (3H, s, H-19), 1.33 (1H, m, H₂-21), 1.28 (3H, s, H-24), 1.25 (3H, s, H-34).

¹³C-NMR (150 MHz, CDCl₃): δ 202.10 (C-12), 178.09 (C-8), 168.66 (C-30), 167.88 (C-18), 163.12 (C-16), 152.96 (C-6), 135.41 (C-33), 135.12 (C-27), 134.13 (C-10), 133.72 (C-9), 131.18 (C-38), 129.76 (C-28), 124.36 (C-37), 121.53 (C-32), 104.85 (C-5), 103.47 (C-17), 100.53 (C-7), 90.43 (C-4), 90.21 (C-14), 84.37 (C-13), 83.66 (C-23), 73.26 (C-2), 48.88 (C-22), 46.61 (C-11), 39.67 (C-20), 30.13 (C-26), 29.92 (C-25), 29.15 (C-24), 26.65 (C-36, C-3), 26.60 (C-19), 25.60 (C-39), 25.19 (C-21), 24.65 (C-35), 21.25 (C-31), 20.47 (C-29), 17.58 (C-40), 16.04 (C-34).

The EIMS data of Product Gh-2641-1 show a molecular on peak [M]⁺ at ink 646, which corresponds to xanthones having a molecular formula of C₃₈H₄₆O₉.

The ¹H-NMR data of product Gh-2641-1 show that Product Gh-2641-1 has a chelated hydroxy group (δ 12.84), four olefinic protons (δ 7.46, δ5.30, δ5.19, and δ 5.04), and a secondary hydroxy group (δ 4.68). As compared to gambogic acid, the ¹H-NMR spectra of product Gh-2641-1 has one less signal of a coupled cis-disubstituted double bond and one more proton signal of AX₂ spin system (δ 4.68 (1H, dd, J=9.8, 6.5 Hz, H-4), δ 3.13 (1H, dd, J=15.3, 6.5 Hz, H₁-3), and δ 3.03 (1H, dd, J=15.3, 9.8 Hz, H₂-3)), which indicates that Product Gh-2641-1 may be a known compound neogambogic acid.

The HMBC data of Product Gh-2641-1 show that: in addition to being correlated with two quaternary carbons (δ 103.47 (C-17) and δ 167.88 (C-18)), the hydroxymethine proton (δ 4.68 (1H, dd, J=9.8, 6.5 Hz, H-4)) is correlated with an oxygen-bearing quaternary carbon (δ 73.26 (C-2)) of a pyran ring and a tertiary methyl group (δ 26.60 (C-19)), evidencing that the hydroxyl group is attached to C-4. It can be known from the coupling constant of H-4 (J=9.8, 6.5 Hz) that the quasi-axial proton on C-4 is coupled to the quasi-axial H₂-3 (J=9.8 Hz) and the quasi-equatorial H₁-3 (J=6.5 Hz), respectively. As such, the hydroxy group is in a β-orientation.

The NOESY data of Product Gh-2641-1 show that: δ 7.46 (H-10) is correlated with δ 3.48 (H-11); δ 3.48 (H-11) is correlated with δ 2.32 (H₁-21); δ 2.32 (H₁-21) is correlated with δ 2.39 (H-22); δ 2.39 (H-22) is correlated with δ 1.28 (H-24); and δ 5.30 (H-27) is correlated with δ 1.51 (H-29), evidencing that the stereostructure of product Gh-2641-1 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, δ 4.68 (H-4) is correlated with δ 1.43 (H-19), which indicates that the methyl proton connected to C-2 is in an axial orientation (or α-orientation). As such, C-2 of Product Gh-2641-1 has a configuration identical to that of gambogic acid, i.e., in an R configuration.

According to the obtained spectral data, Product Gh-2641-1 is identified to be a known compound having the following chemical structure, i.e., neogambogic acid:

23. Product Gh-1631:

Product Gh-1631, which was purified from eluate 19 of fraction 2, was determined to have the following properties:

Yellow needles; mp 95˜97° C.

EIMS m/z (relative intensity): 646 [M]⁺ (54), 618 (75), 573 (12), 545 (8), 520 (13), 492 (75), 491 (100), 477 (18), 449 (38), 373 (19), 349 (11), 321 (15), 295 (27), 267 (10), 252.9 (37), 245 (18), 213 (11), 188.9 (15), 176.9 (11), 109 (24), 99 (20), 69 (83); HREIMS [M]⁺ m/z: 646.3146; calculated for C₃₈H₄₆O₉, 646.3142.

¹H-NMR (600 MHz, CDCl₃): δ 12.45 (1H, s, OH-6), 7.42 (1H, d, J=6.9 Hz, H-10), 5.32 (1H, br d, J=9.9 Hz, H-27), 5.18 (1H, t, J=6.8 Hz, H-32), 5.08 (1H, t, J=7.1 Hz, H-37), 4.75 (1H, t, J=8.1 Hz, H-3), 3.53 (1H, dd, J=15.7, 11.0 Hz, H₁-26), 3.48 (1H, dd, J=6.6, 4.8 Hz, H-11), 3.29 (1H, dd, J=15.1, 7.3 Hz, H₁-31), 3.24 (1H, dd, J=15.2, 6.3 Hz, H₂-31), 3.07 (2H, d, J=8.1 Hz, H-4), 2.69 (1H, ddd, J=15.8, 4.0, 2.3 Hz, H₂-26), 2.53 (1H, d, J=9.4 Hz, H-22), 2.30 (1H, dd, J=13.5, 4.8 Hz, H₁-21), 2.09 (1H, m, H₁-36), 2.02 (1H, m, H₂-36), 1.72 (3H, s, H-34), 1.67 (3H, s, H-35), 1.66 (3H, s, H-39), 1.65 (3H, s, H-25), 1.601 (3H, s, H-40), 1.597 (3H, sh, H-29), 1.57 (1H, m, H₁-20), 1.47 (1H, m, H₂-20), 1.42 (1H, m, H₂-21), 1.42 (3H, s, H-19), 1.23 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 204.15 (C-12), 179.64 (C-8), 168.08 (C-30), 168.02 (C-18), 158.45 (C-16), 157.32 (C-6), 136.74 (C-27, C-33), 134.37 (C-10), 132.40 (C-38), 132.12 (C-9), 128.40 (C-28), 123.56 (C-37), 121.83 (C-32), 105.90 (C-5), 103.96 (C-17), 101.72 (C-7), 90.28 (C-14), 90.00 (C-3), 84.40 (C-13), 83.45 (C-23), 75.77 (C-2), 75.70 (C-2), 48.78 (C-22), 47.71 (C-11), 36.93 (C-20), 29.87 (C-25), 29.32 (C-26), 28.87 (C-24), 25.93 (C-4), 25.71 (C-35), 25.64 (C-39), 25.14 (C-21), 23.54 (C-19), 22.51 (C-31), 22.06 (C-36), 20.91 (C-29), 17.94 (C-34), 17.66 (C-40).

The EIMS data of Product Gh-1631 show a molecular ion peak [M]⁺ at m/z 646 (54) and a base peak at m/z 491 (100), and the HREIMS data of Product Gh-1631 show [M]⁺ at m/z 646.3146, indicating that Product Gh-1631 has a molecular formula identical to that of Product Gh-2641-1 (i.e., neogambogic acid), namely, C₃₈H₄₆O₉.

The ¹H-NMR data of Product Gh-1631 show that: Product Gh-1631 has a chelated hydroxy group (δ 12.45), four olefinic protons (δ 7.42, 5 5.32, δ5.18, and δ 5.08), and a secondary hydroxy group having a hydroxymethine proton (δ 4.75 (1H, t, J=8.1 Hz)) coupled with a methylene proton (δ 3.07 (2H, d, J=8.1 Hz)). The ¹H-NMR data of Product Gh-1631 are generally similar to those of Product Gh-2641-1.

The HMQC data of Product Gh-1631 reveal that: δ 90.00 (—OCH—) and δ 25.93 (—CH₂—) are signals that correspond to a hydroxymethine carbon and a methylene carbon adjacent to the hydroxymethine carbon, respectively. As such, it is presumed that Product Gh-1631 and Product Gh-2641-1 are isomers that differ from each other at the site of the hydroxy group, and Product Gh-1631 may have the hydroxy group connected to C-3.

The HMBC data of Product Gh-1631 show that: δ 4.75 is correlated with δ 168.02 (C-18), δ 105.90 (C-5), δ 75.77 (C-2), δ 75.70 (C-2), δ 25.93 (C-4) and δ 23.54 (C-19); and δ 3.07 is correlated with δ 90.00 (C-3), δ 105.90 (C-5), δ 75.77 (C-2), δ 75.70 (C-2), δ 157.32 (C-6), δ 168.02 (C-18), δ 103.96 (C-17), δ 101.72 (C-7) and δ 158.45 (C-16), evidencing that the hydroxyl group is connected to C-3. In addition, since no conjugated double bond is present therein, the conformation of the pyran ring is in a flexible form, which renders the two protons of the C-4 methylene group to be in equivalence and have identical chemical shift (δ 3.07 (2H, d, J=8.1 Hz, H-4)), in which δ 3.07 is correlated with δ 4.75 (1H, t, J=8.1 Hz, H-3). As such, the hydroxy group on C-3 is in an axial orientation (or β-orientation), and C-3 is in an R configuration.

The NOESY data of Product Gh-1631 reveal that: δ 7.42 (H-10) is correlated with δ 3.48 (H-11); δ 3.48 (H-11) is correlated with δ 2.30 (H₁-21); δ 2.53 (H-22) is correlated with δ 1.42 (H₂-21); δ 2.30 (H₁-21) is correlated with δ 1.23 (H-24); and δ 5.32 (H-27) is correlated with δ 1.597 (H-29), evidencing that the stereostructure of product Gh-1631 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, δ 4.75 (H-3) is correlated with δ 3.07 (H-4), δ 1.42 (H-19), δ 1.47 (H₂-20) and δ 2.02 (H₂-36), which indicates that the C-3 proton is in an equatorial orientation (α-orientation), and the methyl group attached to C-2 is in an axial orientation (α-orientation). As such, C-2 is in an R configuration.

Based on the above information. Product Gh-1631 is identified to be a new compound having the following chemical structure:

Product Gh-1631 is identified by the name “formoxanthone C” {IUPAC nomenclature [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,10R,11R,14aS)-3a,4,5,7,10,11-hexahydro-8,10-dihydroxy-3,3,11-trimethyl-13-(3-methyl-2-butenyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,9H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

24. Product Gh-1050:

Product Gh-1050, which was purified from eluate 17 of fraction 2, was determined to have the following properties:

Yellow powder; mp 5557° C.

EIMS m/z (relative intensity): 644 [M]⁺ (82), 616 (98), 601 (9), 598 (8), 571 (16), 533 (17), 517 (12), 490 (100), 489 (96), 475 (19), 447 (30), 433 (13), 405 (18), 371 (33), 363 (17), 309 (10), 295 (21), 253 (25), 230 (19), 213 (15), 189 (9), 173 (10), 147 (11), 105 (17), 99(25), 69 (42); HREIMS [M]⁺ m/z: 644.2983; calculated for C₃₈H₄₄O₉, 644.2985.

¹H-NMR (600 MHz, CDCl₃): δ 12.69 (1H, s, OH-6), 7.47 (1H, d, J=6.8 Hz, H-10), 5.57 (1H, t, J=7.5 Hz, H-27), 5.19 (1H, t, J=6.8 Hz, H-32), 4.63 (1H, s, H₁-40), 4.29 (1H, s, H₇-40), 3.86 (1H, d, J=3.4 Hz, H-3), 3.65 (1H, t, J=2.6 Hz, H-4), 3.49 (1H, t, J=5.7 Hz, H-11), 3.31 (1H, m, H₁-31), 3.28 (1H, m, H₁-26), 3.23 (1H, dd, J=14.6, 6.2 Hz, H₂-31), 2.82 (1H, dd, J=14.9, 5.6 Hz, H₂-26), 2.55 (1H, d, J=9.4 Hz, H-22), 2.31 (1H, H₁-21), 2.29 (1H, m, H-37), 2.03 (1H, br d, J=13.3 Hz, H₁-20), 1.92 (3H, s, H-39), 1.76 (3H, s, H-34), 1.70 (3H, s, H-25), 1.69 (3H, s, H-35), 1.62 (3H, s, H-29), 1.60 (1H, m, H₂-20), 1.49 (3H, s, H-19), 1.39 (1H, m, H₂-21), 1.31 (2H, m, H-36), 1.29 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 204.09 (C-12), 178.99 (C-8), 168.63 (C-30), 163.38 (C-18), 162.82 (C-6), 155.99 (C-16), 146.45 (C-38), 136.18 (C-27), 134.28 (C-10, C-9), 131.50 (C-33), 128.27 (C-28), 122.31 (C-32), 109.58 (C-40), 106.42 (C-17), 100.23 (C-5), 100.12 (C-7), 90.17 (C-14), 84.66 (C-23), 83.64 (C-13), 79.48 (C-2), 71.37 (C-3), 48.90 (C-22), 48.27 (C-37), 47.01 (C-11), 38.29 (C-20), 36.69 (C-4), 29.93 (C-25), 29.47 (C-26), 28.85 (C-24), 25.73 (C-35), 25.14 (C-21), 23.66 (C-19), 22.95 (C-39), 21.98 (C-36), 21.92 (C-31), 20.93 (C-29), 18.15 (C-34).

The EIMS data of Product Gh-1050 show a molecular ion peak [M]⁺ at m/z 644 and a base peak at m/z 490 (100), and the HREIMS data of Product Gh-1050 show [M]⁺ at m/z 644.2983, indicating that the fragmentation pattern of Product Gh-1050 is similar to that of Product Gh-2603-2 (namely, gambogellic acid), except for having sixteen more mass units than gambogellic acid. Besides, the ¹H-NMR and ¹³C-NMR data of Product Gh-1050 are generally similar to those of Product Gh-2603-2.

The ¹H-NMR, ¹³C-NMR and ¹H-¹H COSY data of Product Gh-1050 show that: the structure of Product Gh-1050 includes a monoterpene moiety having exo-methylene protons (δ 4.63 (H₁-40), δ 4.29 (H₂-40), and δ 109.58 (C-40)) in an isopropenyl group, two adjacent methylene groups (δ 2.03 (1H, br d, J=13.3 Hz, H₁-20), δ 1.60 (1H, m, H₂-20), δ 38.29 (C-20), δ 1.31 (2H, m, H-36), and δ 21.98 (C-36)), a secondary hydroxy group (δ 3.86 (1H, d, J=3.4 Hz, H-3) and δ 71.37 (C-3)), and a methine group (δ 3.65 (1H, t, J=2.6 Hz, H-4) and δ 36.69 (C-4)). Besides, the hydroxymethine proton (δ 3.86 (1H, d, J=3.4 Hz, H-3)) and the methine proton (δ 3.65 (1H, t, J=2.6 Hz, H-4)) are adjacent and are coupled to each other.

The HMBC data of Product Gh-1050 show that: the hydroxymethine proton (δ 3.86 (1H, d, J=3.1 Hz, H-3)) is correlated with not only two quaternary carbons (δ 79.48 (C-2) and δ 100.23 (C-5)) but also two methine groups (δ 36.69 (C-4) and δ 48.27 (C-37)); and δ 3.65 (H-4) is correlated not only with δ 21.98 (C-38), δ 48.27 (C-37), δ 79.48 (C-2), δ 100.23 (C-5), δ 162.82 (C-6) and δ 100.12 (C-7), but also with δ 71.37 (C-3). In addition, the methylene protons (δ 2.03 (H₁-20) and δ 1.60 (H₂-20)) are correlated with δ 79.48 (C-2), δ 48.27 (C-37), δ 23.66 (C-19) and δ 71.37 (C-3); and δ 1.49 (H-19) is correlated with δ 79.48 (C-2), δ 71.37 (C-3), δ 21.98 (C-36) and an aromatic carbon (δ 163.38 (C-18)). Accordingly, it can be known that the hydroxyl group is connected to C-3; 0-2 is connected to C-18 of an aromatic ring via an ether bond; and C-4 is connected to C-5 of the aromatic ring.

The NOESY data of Product Gh-1050 show that: δ 7.47 (H-10) is correlated with δ 3.49 (H-11); δ 3.49 (H-11) is correlated with δ 2.31 (H₁-21); δ 1.39 (H₂-21) is correlated with δ 2.55 (H-22); both δ 2.31 (H₁-21) and δ 2.55 (H-22) are correlated with δ 1.29 (H-24); and δ 5.57 (H-27) is correlated with δ 1.62 (H-29), evidencing that: the stereostructure of Product Gh-1050 in this part is identical to that of gambogic acid or gambogellic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. The NOESY data of Product Gh-1050 also reveal that in addition to being correlated with δ 3.65 (H-4) and δ 1.31 (H-36), δ 2.29 (H-37) is correlated with δ 3.86 (H-3) and δ 1.60 (H₂-20), evidencing that the monoterpene ring has a chair conformation with 1,3-diaxial interaction, in which H-37 and H-3 are in an axial orientation, and both the methyl group (C-19) and the isopropenyl group are in an equatorial orientation. Since the hydroxymethine proton (H-3) is in an axial orientation, the C-3 hydroxyl group is in an equatorial orientation (an α-orientation), and C-3 is in a S configuration. In addition, since δ 1.62 (H-29) is not correlated with δ 4.63 (H₁-40) and δ 4.29 (H₂-40), C-2 is in an R configuration. In view of the aforesaid, it can be known that the monoterpene moiety is in a 2R,3S,4R,37S configuration.

Based on the above information, Product Gh-1050 is identified to be a new compound having the following chemical structure:

Product Gh-1050 is identified by the name “3α-hydroxygambogellic acid” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,9R,10S,13R,16aS,17S)-3a,4,5,7,10,11,12,13-octahydro-8,17-dihydroxy-3,3,13-trimethyl-15-(3-methyl-2-butenyl)-10-(1-methylethenyl)-7,18-dioxo-1,5:9,13-dimethano-1H,3H,9H-furo[3.4-g]oxocino[3.2-b]xanthen-1-yl]-,(2Z)-]}.

25. Product Gh-3291:

Product Gh-3291, which was purified from eluate 7 of fraction 1, was determined to have the following properties:

Yellow powder; mp 103˜106° C.

EIMS m/z (relative intensity): 644 [M]⁺ (10), 626 (10), 616 (12), 545 (67), 517 (19), 471 (15), 459 (6), 419 (10), 389 (21), 349 (11), 347 (20), 309 (9), 295 (17), 271 (13), 253 (20), 245 (26), 227 (21), 215 (56), 189 (23), 171 (11), 147 (16), 129 (28), 105 (35), 99 (50), 84 (43), 69 (84), 55 (100); HREIMS [M]⁺ m/z: 644.2991; calculated for C₃₈H₄₄O₉, 644.2985.

¹H-NMR (600 MHz, CDCl₃): δ 12.76 (1H, s, OH-6), 7.53 (1H, d, J=7.0 Hz, H-10), 6.60 (1H, d, J=10.2 Hz, H-4), 6.06 (1H, t, J=7.6 Hz, H-27), 5.36 (1H, d, J=10.3 Hz, H-3), 5.00 (1H, br t, J=6.3 Hz, H-32), 4.89 (1H, s, H₁-40), 4.81 (1H, d, J=1.0 Hz, H₂-40), 4.00 (1H, t, J=6.2 Hz, H-37), 3.46 (1H, dd, J=6.4, 5.1 Hz, H-11), 3.28 (1H, dd, J=14.9, 8.1 Hz, H₁-31), 3.13 (1H, br dd, J=14.6, 4.7 Hz, H₂-31), 2.93 (1H, dd, J=16.3, 7.9 Hz, H₁-26), 2.87 (1H, dd, J=16.0, 7.6 Hz, H₂-26), 2.51 (1H, d, J=9.3 Hz, H-22), 2.30 (1H, dd, J=13.5, 4.7 Hz, H₁-21), 1.80 (1H, m, H₁-20), 1.73 (3H, s, H-29), 1.71 (3H, s, H-25), 1.68 (3H, s, H-34), 1.67 (1H, m, H₁-36), 1.66 (3H, m, H-39), 1.62 (3H, s, H-35), 1.61 (1H, m, H₂-36), 1.54 (1H, m, H₂-20), 1.39 (3H, s, H-19), 1.38 (1H, m, H₂-21), 1.27 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 203.19 (C-12), 178.90 (C-8), 169.81 (C-30), 161.29 (C-18), 157.61 (C-16), 157.42 (C-6), 147.09 (C-38), 137.26 (C-27), 135.40 (C-10), 133.31 (C-9), 131.65 (C-33), 127.90 (C-28), 124.41 (C-3), 122.27 (C-32), 116.10 (C-4), 111.34 (C-40), 107.64 (C-17), 102.63 (C-5), 100.50 (C-7), 90.91 (C-14), 84.03 (C-23), 83.73 (C-13), 81.07 (C-2), 75.80 (C-37), 49.00 (C-22), 46.83 (C-11), 37.71 (C-20), 29.82 (C-25), 29.29 (C-36), 29.05 (C-26), 28.83 (C-24), 27.73 (C-19), 25.63 (C-35), 25.15 (C-21), 21.58 (C-31), 20.76 (C-29), 18.11 (C-34), 17.45 (C-39).

The EIMS data of Product Gh-3291 show a molecular ion peak [M]⁺ at m/z 644, and the HREIMS data of Product Gh-3291 show [M]⁺ at m/z 644.2991, indicating that Product Gh-3291 has a molecular formula of C₃₈H₄₄O₉, which has 16 more mass units than the molecular formula of gambogic acid.

The ¹H-NMR, ¹³C-NMR and HMQC data of Product Gh-3291 show that Product Gh-3291 has a C-2 side chain different from that of gambogic acid, namely, a 3-hydroxy-4-methyl-4-pentenyl group in lieu of the 4-methyl-3-pentenyl group in gambogic acid. The ¹H-NMR and ¹³C-NMR data of Product Gh-3291 also reveal that Product Gh-3291 has a secondary hydroxy group (δ 4.00 (1H, t, J=6.2 Hz) and δ 75.80) and an exo-methylene group (84.89 (1H, s), δ 4.81 (1H, d), and δ 111.34).

The HMBC data of Product Gh-3291 show that: in addition to being correlated with δ 111.34 (C-40) and δ 147.09 (C-38), the hydroxymethine proton (δ 4.00) is correlated with δ 17.45 (C-39), δ 29.29 (C-36) and δ 37.71 (C-20); in addition to being correlated with δ 37.71 (C-20), the methyl proton (δ 1.39 (H-19)) is correlated with δ 81.07 (C-2) and δ 124.41 (C-3); and δ 5.36 (H-3) is correlated with δ 81.07 (C-2), δ 27.73 (C-19) and δ 37.71 (C-20).

The ¹H-¹H COSY data of Product Gh-3291 show that: δ 4.00 (1H, t, J=6.2 Hz, H-37) is coupled to the methylene protons (δ 1.67 (H₁-36) and 81.61 (H₂-36)), evidencing that the hydroxy group is attached to C-37.

The NOESY data of Product Gh-3291 show that: δ 7.53 (H-10) is correlated with δ 3.46 (H-11); δ 3.46 (H-11) is correlated with δ 2.30 (H₁-21); δ 1.38 (H₂-21) is correlated with δ 2.51 (H-22) and δ 1.27 (H-24); and δ 6.06 (H-27) is correlated with 681.73 (H-29), evidencing that the stereostructure of Product Gh-3291 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration.

The NOESY data of Product Gh-3291 also reveal that: the hydroxymethine proton (δ 4.00 (H-37)) is correlated not only with δ 4.89 (H₁-40) and δ 1.66 (H-39), but also with the protons of two methylene groups (δ 1.80 (H₁-20), δ 1.54 (H₂-20), δ 1.67 (H₁-36) and δ 1.61 (H₂-36)); and δ 5.36 (H-3) is correlated with δ 1.39 (H-19), δ 1.80 (H₁-20), δ 1.54 (H₂-20), δ 1.67 (H₁-36), and δ 1.61 (H₂-36), Besides, since δ 1.39 (H-19) is correlated with δ 1.73 (H-29), C-2 is in an R configuration.

Based on the above information, Product Gh-3291 is identified to be a new compound having the following chemical structure:

Product Gh-3291 is identified by the name “formoxanthone D” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11R,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(3-methyl-2-butenyl)-11-(3-hydroxy-4-methyl-4-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)-]}.

26. Product Gh-3352:

Product Gh-3352, which was purified from eluate 12 of fraction 1, was determined to have the following properties:

Yellow powder; mp 194˜197° C.

FABMS m/z (relative intensity): 645 [M+H]⁺ (11), 634 (10), 591 (11), 575 (13), 574 (22), 573 (45), 559 (12), 545(16), 544 (11), 487 (15), 417 (16), 405 (11), 391 (13), 375 (10), 371 (10), 349 (11), 338 (12), 321 (12), 307 (27), 299 (17), 295 (17), 289 (23), 259 (19), 255 (21), 219 (24), 215 (20), 213 (27), 189 (18), 176 (21), 165 (24), 154 (100), 136 (92), 121 (30), 107 (56), 91 (55), 89 (50), 77 (59), 69 (69), 57 (69), 55 (66); HRFABMS [M+H]⁺ m/z: 645.3066; calculated for C₃₈H₄₅O₉, 645.3064.

¹H-NMR (600 MHz, CDCl₃): δ 12.92 (1H, s, OH-6), 7.52 (1H, d, J=6.9 Hz, H-10), 6.66 (1H, d, J=10.1 Hz, H-4), 5.58 (1H, br t, J=6.5 Hz, H-27), 5.45 (1H, d, J=10.2 Hz, H-3), 5.03 (1H, t, J=7.0 Hz, H-37), 3.79 (1H, dd, J=9.2, 3.1 Hz, H-32), 3.50 (1H, dd, J=6.8, 4.7 Hz, H-11), 3.30 (1H, dd, J=14.8, 10.1 Hz, H₁-26), 2.90 (1H, ddd, J=15.3, 5.6, 1.3 Hz, H₂-26), 2.85 (1H, dd, J=13.9, 9.7 Hz, H₁-31), 2.71 (1H, dd, J=13.8, 3.4 Hz, H₂-31), 2.49 (1H, d, J=9.3 Hz, H-22), 2.33 (1H, dd, J=13.5, 4.7 Hz, H₁-21), 2.05 (2H, m, H-36), 1.74 (3H, s, H-25), 1.73 (1H, m, H₁-20), 1.69 (3H, s, H-29), 1.66 (1H, m, H₂-20), 1.63 (3H, s, H-39), 1.53 (3H, s, H-40), 1.45 (3H, s, H-19), 1.33 (1H, m, H₂-21), 1.29 (3H, s, H-34), 1.27 (3H, s, H-35), 1.25 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 202.89 (C-12), 179.05 (C-8), 168.89 (C-30), 161.34 (C-18), 158.49 (C-6), 158.28 (C-16), 136.09 (C-27), 135.01 (C-10), 133.19 (C-9), 132.17 (C-38), 129.31 (C-28), 124.75 (C-3), 123.46 (C-37), 115.93 (C-4), 104.83 (C-17), 102.92 (C-5), 100.67 (C-7), 90.77 (C-14), 84.28 (C-13), 83.86 (C-23), 81.81 (C-2), 77.20 (C-32), 73.24 (C-33), 49.12 (C-22), 47.04 (C-11), 41.72 (C-20), 30.56 (C-25), 29.65 (C-26), 28.89 (C-24), 27.18 (C-19), 25.89 (C-31), 25.69 (C-39), 25.63 (C-35), 25.36 (C-21), 23.75 (C-34), 22.66 (C-36), 20.73 (C-29), 17.59 (C-40).

The HRFABMS data of Product Gh-3352 show a pseudomolecular ion peak [M+H]⁺ at m/z 645.3066, suggesting that Product Gh-3352 has a molecular formula of C₃₈H₄₄O₉, which has sixteen more mass units than the molecular formula of gambogic acid.

The ¹H-NMR, ¹³C-NMR and HMQC data of Product Gh-3352 show that Product Gh-3352 has a C-17 side chain different from that of gambogic acid, namely, a 2,3-epoxy-3-methylbutyl group in lieu of the 3-methyl-2-butenyl group in gambogic acid. As compared to gambogic acid, the unsaturation number of Product Gh-3352 remains unchanged.

The ¹H-¹H COSY, HMQC and HMBC data of Product Gh-3352 show that: an oxymethine proton (δ 3.79 (1H, dd, J=9.2, 3.1 Hz)) is coupled to a methylene proton (δ 2.85 (1H, dd, J=13.9, 9.7 Hz, H₁-31)); and δ 2.85 is coupled to another methylene proton (δ 2.71 (1H, dd, J=13.8, 3.4 Hz, H₂-31)). Besides, Product Gh-3352 has two tertiary methyl groups (δ 1.29 (3H, s, H-34) and δ 1.27 (3H, s, H-35)) attached to an oxygen-bearing quaternary carbon. It can be known from the signals of the oxygen-bearing quaternary carbon (δ 73.24 (C-33)), the oxymethine carbon (δ 77.20 (CH)) and the methylene carbon (δ 25.89 (CH₂), C-31) that an epoxy group is located at C-32 and C-33.

The HMBC data of Product Gh-3352 show that δ 2.85 (H₁-31) is correlated with δ 77.20 (C-32) and δ 104.83 (C-17), evidencing that the side attached to C-17 is a 2,3-epoxy-3-methylbutyl group.

The NOESY data of Product Gh-3352 show that: δ 7.52 (H-10) is correlated with δ 3.50 (H-11); δ 3.50 (H-11) is correlated with δ 2.33 (H₁-21) and δ 1.33 (H₂-21); δ 1.33 (H₂-21) and δ 2.49 (H-22) are correlated; δ 2.49 (H-22) is correlated with δ 1.74 (H-25); and δ 5.58 (H-27) is correlated with δ 1.69 (H-29), evidencing that the stereostructure of Product Gh-3352 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, since δ 1.69 (H-29) is correlated with δ 1.45 (H-19), C-2 is in an R configuration.

Based on the above information, Product Gh-3352 is identified to be a new compound having the following chemical structure:

Product Gh-3352 is identified by the name “formoxanthone E” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11R,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(2,3-epoxy-3-methylbutyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11 furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

27. Product Gh-3351:

Product Gh-3351, which was purified from eluate 10 of fraction 1, was determined to have the following properties:

Yellow powder; mp 168-171° C.

EIMS m/z (relative intensity): 621 (6), 603 (17), 589 (100), 577 (23), 561 (19), 503 (47), 467 (6), 423 (8), 381 (5), 339 (4), 315 (15), 231 (7), 213 (9), 135 (4), 69 (15); HRFABMS [M+H]⁺ m/z: 645.3070; calculated for C₃₈H₄₅O₉, 645.3064.

¹H-NMR (600 MHz, CDCl₃): δ 12.91 (1H, s, OH-6), 7.51 (1H, d, J=6.9 Hz, H-10), 6.49 (1H, d, J=10.1 Hz, H-4), 5.56 (1H, br t, J=7.3 Hz, H-27), 5.43 (1H, d, J=10.2 Hz, H-3), 5.03 (1H, t, J=7.0 Hz, H-37), 3.76 (1H, br d, J=7.0 Hz, H-32), 3.50 (1H, dd, J=6.6, 4.9 Hz, H-11), 3.29 (1H, dd, J=15.2, 10.1 Hz, H₁-26), 2.89 (1H, ddd, J=15.3, 5.5, 1.5 Hz, H₂-26), 2.82 (1H, dd, J=13.9, 9.9 Hz, H₁-31), 2.69 (H, br d, J=12.7 Hz, H₂-31), 2.48 (1H, d, J=9.3 Hz, H-22), 2.32 (1H, dd, J=13.5, 4.0 Hz, H₁-21), 2.03 (2H, m, H-36), 1.73 (3H, s, H-25), 1.68 (3H, s, H-29), 1.67 (2H, m, H-20), 1.62 (3H, s, H-39), 1.53 (3H, s, H-40), 1.43 (3H, s, H-19), 1.30 (1H, m, H₂-21), 1.28 (3H, s, H-34), 1.26 (3H, s, H-35), 1.24 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 202.99 (C-12), 179.03 (C-8), 169.60 (C-30), 161.37 (C-18), 158.46 (C-6), 158.25 (C-16), 135.76 (C-27), 134.92 (C-10), 133.21 (C-9), 132.14 (C-38), 129.58 (C-28), 124.72 (C-3), 123.47 (C-37), 115.90 (C-4), 104.81 (C-17), 102.88 (C-5), 100.63 (C-7), 90.74 (C-14), 84.26 (C-13), 83.79 (C-23), 81.75 (C-2), 77.15 (C-32), 73.25 (C-33), 49.11 (C-22), 47.04 (C-11), 41.71 (C-20), 30.56 (C-25), 29.69 (C-26), 28.88 (C-24), 27.13 (C-19), 25.92 (C-31), 25.89 (C-39), 25.63 (C-35), 25.36 (C-21), 23.44 (C-34), 22.65 (C-36), 20.74 (C-29), 17.59 (C-40).

The EIMS data of Product Gh-3351 show a base peak at m/z 589 (100), and the HRFABMS data of Product Gh-3351 show a pseudomolecular ion peak [M+H]⁺ at m/z 645.3070, indicating that Product Gh-3351 has a molecular formula of C₃₈H₄₄O₉, which has sixteen more mass units than the molecular formula of gambogic acid.

The ¹H-NMR, ¹³C-NMR and HMQC data of Product Gh-3351 show that Product Gh-3351 has a C-17 side chain different from that of gambogic acid, namely a 2,3-epoxy-3-methylbutyl group in lieu of the 3-methyl-2-butenyl group in gambogic acid. As compared to gambogic acid, the unsaturation number of Product Gh-3351 remains unchanged.

The ¹H-¹H COSY, HMQC and HMBC data of Product Gh-3351 show that: an oxymethine proton (δ 3.76 (1H, br d, J=7.0 Hz)) is coupled to a methylene proton (δ 2.82 (1H, dd, J=13.9, 9.9 Hz, H₁-31)); and δ 2.82 is coupled to another methylene proton (δ 2.69 (1H, br d, J=12.7 Hz, H₂-31)). Besides, Product Gh-3351 has two oxygen-bearing tertiary methyl protons (δ 1.28 (3H, s, H-34) and δ 1.26 (3H, s, H-35)]. Based on the signals of the oxygen-bearing quaternary carbon (δ 73.25 (C-33)), the oxymethine group (δ 77.15 (C-32)) and the methylene group (δ 25.92 (C-31)), it can be known that an epoxy group is located at C-32 and C-33.

The HMBC data of Product Gh-3351 show that: δ 2.82 (H₁-31) is correlated with δ 77.15 (C-32), δ 102.88 (C-5), δ 104.81 (C-17), δ 158.25 (C-16) and δ 161.37 (C-18), evidencing that the side chain attached to C-17 is a 2,3-epoxy-3-methylbutyl group.

The NOESY data of Product Gh-3351 show that: δ 7.51 (H-10) is correlated with δ 3.50 (H-11); δ 3.50 (H-11) is correlated with δ 2.32 (H₁-21) and δ 1.30 (H₂-21); δ 1.30 (H₂-21) is correlated with δ 2.48 (H-22); δ 2.48 (H-22) is correlated with δ 1.73 (H-25); and δ 5.56 (H-27) is correlated with δ 1.68 (H-29), evidencing that the stereostructure of Product Gh-3351 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, since δ 1.68 (H-29) is correlated with δ 2.03 (H-36), C-2 is in an S configuration.

Based on the above information, product Gh-3351 is identified to be a new compound having the following chemical structure:

Product Gh-3351 is identified by the name “epiforxanthone E” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11S,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(2,3-epoxy-3-methylbutyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

28. Product Gh-1052:

Product Gh-1052, which was purified from eluate 9 of fraction 1, was determined to have the following properties:

Yellow powder; mp 83˜85° C.

EIMS m/z (relative intensity): 662 [M]⁺ (6), 634 (8), 579 (100), 551 (16), 545 (9), 507 (14), 489 (6), 417 (12), 389 (4), 349 (4), 295 (5), 245 (8), 214.9 (14), 189 (8), 147 (4), 99 (7), 69 (29); HREIMS [M]⁺ m/z: 662.3096; calculated for C₃₈H₄₆O₁₀, 662.3091.

¹H-NMR (600 MHz, CDCl₃): δ 12.92 (1H, s, OH-6), 7.52 (1H, d, J=7.0 Hz, H-10), 6.65 (1H, d, J=10.2 Hz, H-4), 5.63 (1H, t, J=7.4 Hz, H-27), 5.46 (1H, d, J=10.3 Hz, H-3), 5.07 (1H, t, J=7.1 Hz, H-37), 3.74 (1H, dd, J=10.0, 3.4 Hz, H-32), 3.49 (1H, dd, J=6.7, 4.7 Hz, H-11), 3.25 (1H, dd, J=15.2, 9.9 Hz, H₁-26), 2.89 (1H, ddd, J=15.3, 5.9, 1.7 Hz, H₂-26), 2.84 (1H, dd, J=13.9, 10.1 Hz, H₁-31), 2.72 (1H, dd, J=13.9, 3.4 Hz, H₂-31), 2.49 (1H, d, J=9.3 Hz, H-22), 2.32 (1H, dd, J=13.5, 4.7 Hz, H₁-21), 2.07 (2H, m, H-36), 1.79 (1H, m, H₁-20), 1.73 (3H, s, H-25), 1.69 (3H, s, H-29), 1.67 (1H, m, H₂-20), 1.65 (3H, s, H-39), 1.57 (3H, s, H-40), 1.37 (3H, s, H-19), 1.33 (1H, dd, J=13.5, 9.6 Hz, H₂-21), 1.27 (3H, s, H-35), 1.26 (3H, s, H-24), 1.24 (3H, s, H-34).

¹³C-NMR (150 MHz, CDCl₃): δ 202.93 (C-12), 179.10 (C-8), 169.18 (C-30), 161.47 (C-18), 158.49 (C-6), 158.22 (C-16), 136.45 (C-27), 135.16 (C-10), 133.12 (C-9), 132.66 (C-38), 129.08 (C-28), 124.56 (C-3), 123.36 (C-37), 116.12 (C-4), 104.92 (C-17), 102.95 (C-5), 100.63 (C-7), 90.82 (C-14), 84.18 (C-13), 83.82 (C-23), 81.76 (C-2), 77.11 (C-32), 73.09 (C-33), 49.08 (C-22), 47.03 (C-11), 41.74 (C-20), 30.62 (C-25), 29.54 (C-26), 28.83 (C-24), 27.21 (C-19), 25.87 (C-35), 25.68 (C-31), 25.65 (C-39), 25.33 (C-21), 23.65 (C-34), 22.91 (C-36), 20.74 (C-29), 17.71 (C-40).

The EIMS data of Product Gh-1052 show a molecular ion peak [M]⁺ at m/z 662 and a base peak at m/z 579 (100), and the HREIMS data of Product Gh-1052 show [M]⁺ at m/z 662.3096, indicating that Product Gh-1052 has a molecular formula of C₃₈H₄₆O₁₀, which has thirty-four more mass units than the molecular formula of gambogic acid.

The ¹H-NMR, ¹³C-NMR and HMQC data of Product Gh-1052 show that Product Gh-1052 has a C-17 side chain different from that of gambogic acid, namely, a 2,3-dihydroxy-3-methylbutyl group in lieu of the 3-methyl-2-butenyl group in gambogic acid.

The ¹H-NMR and ¹³C-NMR data of Product Gh-1052 show that Product Gh-1052 has a secondary hydroxy group (δ 3.74 (1H, dd, J=10.0, 3.4 Hz) and δ 77.11] and an oxygen-bearing quaternary carbon (δ 73.09). In addition, the ¹H-¹H COSY data of Product Gh-1052 show that a hydroxymethine proton (δ 3.74 (1H, dd, J=10.0, 3.4 Hz)) is coupled to two methylene protons (δ 2.84 (1H, dd, J=13.9, 10.1 Hz, H₁-31) and δ 2.72 (1H, dd, J=13.9, 3.4 Hz, H₂-31)).

The HMQC data of Product Gh-1052 show that: C-31 (δ 25.68) is a methylene group; the secondary hydroxy group is connected to C-32 (δ 77.11); a tertiary hydroxy group is connected to C-33 (δ 73.09); and C-35 (δ 25.87) and C-34 (δ 23.65) are tertiary methyl groups.

The HMBC data of Product Gh-1052 show that: δ 3.74 (H-32) is correlated with δ 73.09 (C-33) and δ 23.65 (C-34); both δ 2.84 (H₁-31) and δ 2.72 (H₂-31) are correlated with δ 104.92 (C-17), δ 161.47 (C-18), δ 158.22 (C-16) and δ 77.11 (C-32); H₁-31 is also correlated with δ 73.09 (C-33); δ 1.24 (H-34) and δ 1.27 (H-35) are both correlated with δ 77.11 (C-32) and δ 73.09 (C-33); H-34 is also correlated with δ 25.87 (C-35); and H-35 is correlated with δ 23.65 (C-34), evidencing that the side chain attached to C-17 is a 2,3-dihydroxy-3-methylbutyl group.

The NOESY data of Product Gh-1052 show that: δ 7.52 (H-10) is correlated with δ 3.49 (H-11); δ 3.49 (H-11) is correlated with δ 2.32 (H₁-21) and δ 1.33 (H₂-21); δ 1.33 (H₂-21) is correlated with δ 2.49 (H-22); δ 2.49 (H-22) is correlated with δ 1.73 (H-25); and δ 5.63 (H-27) is correlated with δ 1.69 (H-29), evidencing that the stereostructure of Product Gh-1052 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, since δ 1.37 (H-19) is correlated with δ 1.69 (H-29), C-2 is in an R configuration.

Based on the above information, Product Gh-1052 is identified to be a new compound having the following chemical structure:

Product Gh-1052 is identified by the name “formoxanthone F” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11R,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(2,3-dihydroxy-3-methylbutyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

29. Product Gh-1036:

Product Gh-1036, which was purified from eluate 6 of fraction 1, was determined to have the following properties:

Yellow powder; mp 7678° C.

EIMS m/z (relative intensity): 662 [M]⁺ (13), 634 (7), 579 (100), 551 (13), 545 (10), 507 (12), 489 (5), 417 (9), 375 (3), 349 (3), 295 (4), 245 (8), 215 (8), 213 (7), 147 (4), 105 (5), 69 (19); HREIMS [M]⁺ m/z 662.3098; calculated for C₃₈H₄₆O₁₀, 662.3091.

¹H-NMR (600 MHz, CDCl₃): δ 12.91 (1H, s, OH-6), 7.52 (1H, d, J=6.9 Hz, H-10), 6.66 (1H, d, J=10.0 Hz, H-4), 5.53 (1H, br t, J=5.2 Hz, H-27), 5.47 (1H, d, J=10.1 Hz, H-3), 5.08 (1H, t, J=6.9 Hz, H-37), 3.74 (1H, dd, J=11.2, 2.6 Hz, H-32), 3.49 (1H, 1, J=5.6 Hz, H-11), 3.27 (1H, dd, J=15.0, 10.4 Hz, H₁-26), 2.87 (1H, dd, J=13.6, 11.7 Hz, H₁-31), 2.82 (1H, br dd, J=15.3, 3.8 Hz, H₂-26), 2.72 (1H, dd, J=13.7, 2.8 Hz, H₂-31), 2.48 (1H, d, J=9.2 Hz, H-22), 2.32 (1H, dd, J=13.5, 4.5 Hz, H₁-21), 2.10 (2H, m, H-36), 1.78 (1H, m, H₁-20), 1.702 (3H, s, H-25), 1.697 (1H, m, H₂-20), 1.653 (3H, s, H-29), 1.648 (3H, s, H-39), 1.58 (3H, s, H-40), 1.35 (3H, s, H-19), 1.33 (1H, m, H₂-21), 1.28 (3H, s, H-35), 1.25 (3H, s, H-24), 1.24 (3H, s, H-34).

¹³C-NMR (150 MHz, CDCl₃): δ 202.96 (C-12), 179.04 (C-8), 168.66 (C-30), 161.45 (C-18), 158.35 (C-6), 158.28 (C-16), 135.28 (C-27), 134.98 (C-10), 133.19 (C-9), 132.39 (C-38), 129.46 (C-28), 124.77 (C-3), 123.52 (C-37), 116.07 (C-4), 104.54 (C-17), 103.19 (C-5), 100.64 (C-7), 90.87 (C-14), 84.28 (C-13), 83.60 (C-23), 81.71 (C-2), 76.57 (C-32), 73.06 (C-33), 49.07 (C-22), 46.99 (C-11), 41.68 (C-20), 30.76 (C-25), 29.96 (C-26), 28.86 (C-24), 26.79 (C-19), 26.29 (C-35), 25.63 (C-39), 25.42 (C-21), 24.62 (C-31), 23.56 (C-34), 22.82 (C-36), 20.52 (C-29), 17.62 (C-40).

The EIMS data of Product Gh-1036 show a molecular ion peak [M]⁺ at m/z 662 and a base peak at m/z 579 (100), and the HREIMS data of Product Gh-1036 show [M]⁺ at m/z 662.3098, indicating that Product Gh-1036 has a molecular formula of C₃₈H₄₆O₁₀, which has thirty-four more mass units than the molecular formula of gambogic acid.

The ¹H-NMR, ¹³C-NMR and HMQC data of Product Gh-1036 show that Product Gh-1036 has a C-17 side chain different from that of gambogic acid, namely, a 2,3-dihydroxy-3-methylbutyl group in lieu of the 3-methyl-2-butenyl group in gambogic acid.

The ¹H-NMR and ¹³C-NMR data of Product Gh-1036 show that Product Gh-1036 has a secondary hydroxy group (63.74 (1H, dd, J=11.2, 2.6 Hz) and δ 76.57) and an oxygen-bearing quaternary carbon (δ 73.06).

In addition, the ¹H-¹H COSY data of Product Gh-1036 show that a hydroxymethine proton (63.74 (1H, dd, J=11.2, 2.6 Hz)) is coupled to two methylene protons (δ 2.87 (1H, dd, J=13.6, 11.7 Hz, H₁-31) and δ 2.72 (1H, dd, J=13.7, 2.8 Hz, H₂-31)).

The HMQC data of product Gh-1036 show that: C-31 (δ 24.62) is a methylene group; a secondary hydroxy group is connected to C-32 (δ 76.57); a tertiary hydroxy group is connected to C-33 (δ 73.06); and C-34 (δ 23.56) and C-35 (δ 26.29) are tertiary methyl groups.

The HMBC data of Product Gh-1036 show that: in addition to being correlated with 624.62 (C-31), δ 73.06 (C-33) and 623.56 (C-34), δ 3.74 (H-32) is correlated with δ 104.54 (C-17); and both δ 2.87 (H₁-31) and 6 2.72 (H₂-31) are correlated with δ 76.57 (C-32), δ 73.06 (C-33), δ 104.54 (C-17), δ 161.45 (C-18) and δ 158.28 (C-16), evidencing that the side chain attached to C-17 is a 2,3-dihydroxy-3-methylbutyl group.

The NOESY data of Product Gh-1036 show that: δ 7.52 (H-10) is correlated with δ 3.49 (H-11); δ 3.49 (H-11) is correlated with δ 2.32 (H₁-21) and δ 1.33 (H₂-21); δ 1.33 (H₂-21) is correlated with δ 2.48 (H-22); δ 2.48 (H-22) is correlated with δ 1.702 (H-25); and δ 5.53 (H-27) is correlated with δ 1.653 (H-29), evidencing that the stereostructure of Product Gh-1036 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, since δ 1.653 (H-29) is correlated with δ 1.78 (H₁-20) and δ 2.10 (H-36), C-2 is in an S configuration.

Based on the above information, Product Gh-1036 is identified to be a new compound having the following chemical structure:

Product Gh-1036 is identified by the name “epiformoxanthone F” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11S,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(2,3-dihydroxy-3-methylbutyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

30. Product Gh-3353:

Product Gh-3353, which was purified from eluate 11 of fraction 1, was determined to have the following properties:

Yellow powder; mp 158˜162° C.

EIMS m/z (relative intensity): 590 (32), 589 (100), 577 (24), 561 (19), 503 (44), 467 (6), 423 (8), 381 (5), 339 (4), 315 (8), 311 (3), 285 (2), 247 (4), 231 (6), 205 (2), 135 (4), 81 (3), 69 (14); HRFABMS [M+H]⁺ m/z: 661.3019; calculated for C₃₈H₄₅O₁₀, 661.3013.

¹H-NMR (600 MHz, CDCl₃): δ 13.13 (1H, s, OH-6), 7.56 (1H, d, J=7.1 Hz, H-10), 6.62 (1H, d, J=10.1 Hz, H-4), 5.44 (1H, d, J=10.3 Hz, H-3), 5.15 (1H, d, J=8.9 Hz, H-31), 5.04 (1H, br t, J=3.5 Hz, H-37), 5.01 (1H, m, H-27), 4.70 (1H, d, J=8.9 Hz, H-32), 3.55 (1H, dd, J=6.6, 4.9 Hz, H-11), 3.42 (1H, t, J=13.4 Hz, H₁-26), 2.73 (1H, br d, J=13.9 Hz, H₂-26), 2.52 (1H, d, J=9.3 Hz, H-22), 2.36 (1H, dd, J=13.5, 7.7 Hz, H₁-21), 2.05 (2H, m, H-36), 1.82 (3H, s, H-25), 1.76 (1H, m, H₁-20), 1.64 (3H, s, H-35), 1.63 (1H, m, H₂-20), 1.62 (3H, s, H-39), 1.54 (3H, s, H-40), 1.49 (3H, s, H-29), 1.44 (6H, s, H-19, H-34), 1.27 (1H, m, H₂-21), 1.26 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 202.26 (C-12), 179.10 (C-8), 166.33 (C-30), 161.08 (C-18), 159.90 (C-16), 158.73 (C-6), 134.79 (C-10), 132.77 (C-9), 132.73 (C-28), 132.09 (C-38), 128.48 (C-27), 124.60 (C-3), 123.55 (C-37), 115.48 (C-4), 105.98 (C-17), 101.92 (C-5), 99.90 (C-7), 91.89 (C-14), 84.63 (C-13), 83.75 (C-33), 83.70 (C-23), 82.16 (C-2), 76.83 (C-32), 67.26 (C-31), 49.47 (C-22), 46.71 (C-11), 41.97 (C-20), 31.14 (C-26), 30.13 (C-25), 29.42 (C-24), 27.60 (C-19), 26.05 (C-21), 25.63 (C-39), 23.89 (C-35), 22.43 (C-36), 19.98 (C-29), 18.80 (C-34), 17.66 (C-40).

The EIMS data of Product Gh-3353 show a base peak at m/z 589 (100), and the HRFABMS data of product Gh-3353 show a pseudomolecular ion peak [M+H]⁺ at m/z 661.3019, indicating that Product Gh-3353 has a molecular formula of C₃₈H₄₄O₁₀, which has thirty-two more mass units than the molecular formula of gambogic acid.

The ¹H-NMR, ¹³C-NMR and HMQC data of Product Gh-3353 show that Product Gh-3353 has a C-17 side chain different from that of gambogic acid, namely, a 1-hydroxy-2,3-epoxy-3-methylbutyl group in lieu of the 3-methyl-2-butenyl group in gambogic acid.

The ¹H-NMR, ¹³C-NMR and ¹H-¹H COSY data of Product Gh-3353 show that a hydroxymethine proton (δ 5.15 (1H, d, J=8.9 Hz)) is coupled to an oxymethine proton (δ 4.70 (1H, d, J=8.9 Hz)) on an epoxy group. Since the two vicinal oxymethine protons on an epoxy ring have a coupling constant (J) normally less than 5 Hz, the coupling constant of J=8.9 Hz should not represent the coupling of the two vicinal oxymethine protons on the epoxy ring.

The HMBC data of Product Gh-3353 show that: δ 5.15 is correlated with δ 161.08 (C-18), δ 159.90 (C-16), δ 105.98 (C-17) and δ 76.83 (C-32); and δ 4.70 is correlated with δ 83.75 (C-33), δ 18.80 (C-34), δ 23.89 (C-35) and δ 67.26 (C-31), evidencing that a hydroxy group is connected to C-31; an epoxy group is located at C-32 and C-33; and the side chain attached to C-17 is a 1-hydroxy-2,3-epoxy-3-methylbutyl group.

The NOESY data of Product Gh-3353 show that: δ 7.56 (H-10) is correlated with δ 3.55 (H-11); δ 3.55 (H-11) is correlated with δ 2.36 (H₁-21) and δ 1.27 (H₂-21); both δ 2.36 (H₁-21) and δ 1.27 (H₂-21) are correlated with δ 2.52 (H-22); δ 2.52 (H-22) is correlated with δ 1.82 (H-25) and δ 1.26 (H-24); δ 5.01 (H-27) is correlated with δ 1.49 (H-29); and δ 1.49 (H-29) is not correlated with δ 2.05 (H-36) or δ 1.76 (H₁-20), evidencing that the stereostructure of Product Gh-3353 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, δ 5.04 (H-37) is correlated with δ 1.62 (H-39) and δ 1.54 (H-40), and δ 2.05 (H-36) is correlated with δ 1.76 (H₁-20). Since δ 1.49 (H-29) is not correlated with δ 2.05 (H-36) or δ 1.76 (H₁-20), C-2 has an R configuration.

Based on the above information, Product Gh-3353 is identified to be a new compound having the following chemical structure:

Product Gh-3353 is identified by the name “formoxanthone G” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11R,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(1-hydroxy-2,3-epoxy-3-methylbutyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

31. Product Gh-3311:

Product Gh-3311, which was purified from eluate 4 of fraction 1, was determined to have the following properties:

Yellow powder; mp 144˜148° C.

EIMS m/z (relative intensity): 590 (7), 589 (18), 577 (5), 561 (9), 503 (11), 467 (2), 423 (2), 347 (5), 315 (3), 285 (3), 247 (6), 233 (13), 231 (22), 230 (16), 215 (8), 202 (4), 131 (6), 117 (100), 115 (19), 91 (12), 69 (14); HRFABMS [M+H]⁺ m/z: 661.3010; calculated for C₃₈H₄₅O₁₀, 661.3013.

¹H-NMR (600 MHz, CDCl₃): δ 13.12 (1H, s, OH-6), 7.56 (1H, d, J=7.1 Hz, H-10), 6.65 (1H, d, J=10.0 Hz, H-4), 5.52 (1H, d, J=10.2 Hz, H-3), 5.17 (1H, d, J=9.0 Hz, H-31), 5.05 (1H, m, H-37), 5.03 (1H, m, H-27), 4.71 (1H, d, J=9.0 Hz, H-32), 3.56 (1H, dd, J=6.8, 4.8 Hz, H-11), 3.42 (1H, t, J=13.5 Hz, H₁-26), 2.74 (1H, br d, J=13.7 Hz, H₂-26), 2.54 (1H, d, J=9.3 Hz, H-22), 2.37 (1H, dd, J=13.5, 4.8 Hz, H₁-21), 2.05 (2H, m, H-36), 1.86 (1H, m, H₁-20), 1.83 (3H, s, H-25), 1.69 (1H, m, H₂-20), 1.66 (3H, s, H-39), 1.64 (3H, s, H-35), 1.56 (3H, s, H-40), 1.49 (3H, s, H-29), 1.45 (3H, s, H-34), 1.35 (3H, s, H-19), 1.28 (1H, m, H₂-21), 1.26 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 202.22 (C-12), 179.25 (C-8), 166.30 (C-30), 160.99 (C-18), 159.85 (C-16), 158.80 (C-6), 134.86 (C-10), 132.81 (C-9), 132.75 (C-28), 132.17 (C-38), 128.54 (C-27), 125.25 (C-3), 123.50 (C-37), 116.08 (C-4), 106.57 (C-17), 102.68 (C-5), 100.01 (C-7), 91.92 (C-14), 84.65 (C-13), 83.80 (C-33), 83.66 (C-23), 81.92 (C-2), 76.98 (C-32), 67.16 (C-31), 49.47 (C-22), 46.75 (C-11), 41.64 (C-20), 31.16 (C-26), 30.15 (C-25), 29.43 (C-24), 26.90 (C-19), 26.08 (C-21), 25.67 (C-39), 23.83 (C-35), 23.21 (C-36), 19.89 (C-29), 18.91 (C-34), 17.72 (C-40).

The EIMS data of Product Gh-3311 show a base peak at m/z 117 (100) but no molecular ion peak [M], and the HRFABMS data of Product Gh-3311 show a pseudomolecular ion peak [M+H]⁺ at m/z 661.3010, indicating that Product Gh-3311 has a molecular formula of C₃₈H₄₄O₁₀, which has thirty-two more mass units compared to the molecular formula of gambogic acid. As compared to gambogic acid, the unsaturation number of Product Gh-3331 remains unchanged.

The ¹H-NMR and ¹³C-NMR data of Product Gh-3311 show that Product Gh-3311 has a secondary hydroxy group (δ 5.17 (1H, d, J=9.0 Hz) and δ 67.16) and an epoxy group (δ 4.71 (1H, d, J=9.0 Hz) and δ 76.98). These ¹H-NMR and ¹³C-NMR data of Product Gh-3311 are very similar to those of Product Gh-3353.

The ¹H-¹H COSY data of Product Gh-3311 show that the hydroxymethine proton (δ 5.17 (1H, d, J=9.0 Hz)) is coupled to the oxymethine proton (δ 4.71 (1H, d, J=9.0 Hz)) of the epoxy group, with a coupling constant (J) of 9.0 Hz. Since the two vicinal oxymethine protons on an epoxy ring have a coupling constant (J) normally less than 5 Hz, the coupling constant of J=8.9 Hz should not represent the coupling of the two vicinal oxymethine protons on the epoxy ring.

The HMBC data of Product Gh-3311 show that: δ 5.17 is correlated with δ 160.99 (C-18), δ 159.85 (C-16), δ 106.57 (C-17) and δ 76.98 (C-32); and δ 4.71 is correlated with δ 83.80 (C-33), δ 18.91 (C-34) and δ 67.16 (C-31), evidencing that the hydroxy group is connected to C-31, the epoxy group is located at C-32 and C-33, and the side chain attached to C-17 is a 1-hydroxy-2,3-epoxy-3-methylbutyl group.

The NOESY data of Product Gh-3311 show that: δ 7.56 (H-10) is correlated with δ 3.56 (H-11); δ 3.56 (H-11) is correlated with δ 2.37 (H₁-21) and δ 1.28 (H₂-21); both δ 2.37 (H₁-21) and δ 1.28 (H₂-21) are correlated with δ 2.54 (H-22); δ 2.54 (H-22) is correlated with δ 1.83 (H-25) and δ 1.26 (H-24); and δ 5.03 (H-27) is correlated with δ 1.49 (H-29), evidencing that the stereostructure of Product Gh-3311 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, since δ 1.49 (H-29) is correlated with δ 1.86 (H₁-20) and δ 1.69 (H₂-20), C-2 is in an S configuration.

Based on the above information, product Gh-3311 is identified to be a new compound having the following chemical structure:

Product Gh-3311 is identified by the name “epiformoxanthone G” (IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11S₁14 aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(1-hydroxy-2,3-epoxy-3-methylbutyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

32. Product Gh-3272:

Product Gh-3272, which was purified from eluate 3 of fraction 1, was determined to have the following properties:

Yellow powder; mp 190˜193° C.

EIMS m/z (relative intensity): 626 [M−H₂O]⁺ (2), 598 (2), 545 (100), 517 (3), 499 (2), 389 (3), 347 (3), 271 (2), 245 (4), 215 (11), 189 (4), 147 (1), 105 (2), 69 (2); HRFABMS [M−H₂O+H]⁺ m/z: 627.2961; calculated for C₃₈H₄₃O₈, 627.2958.

¹H-NMR (600 MHz, CDCl₃): δ 12.71 (1H, s, OH-6), 7.52 (1H, d, J=6.9 Hz, H-10), 6.57 (1H, d, J=10.1 Hz, H-4), 6.03 (1H, dt, J=7.5, 1.3 Hz, H-27), 5.59 (1H, d, J=15.7 Hz, H-37), 5.53 (1H, dt, J=15.6, 6.9 Hz, H-36), 5.34 (1H, d, J=10.1 Hz, H-3), 5.02 (1H, dt, J=6.2, 1.2 Hz, H-32), 3.46 (1H, dd, J=6.7, 4.6 Hz, H-11), 3.27 (1H, dd, J=14.7, 8.2 Hz, H₁-31), 3.11 (1H, br dd, J=14.6, 5.2 Hz, H₂-31), 2.94 (2H, br t, J=5.6 Hz, H-26), 2.49 (1H, d, J=9.3 Hz, H-22), 2.36 (1H, dd, J=13.9, 7.2 Hz, H₁-20), 2.29 (1H, dd, J=13.6, 4.8 Hz, H₁-21), 2.25 (1H, dd, J=14.0, 6.5 Hz, H₂-20), 1.72 (3H, s, H-34), 1.70 (3H, d, J=1.1 Hz, H-29), 1.67 (3H, s, H-25), 1.63 (3H, s, H-35), 1.38 (3H, S. H-19), 1.37 (1H, m, H₂-21), 1.27 (3H, s, H-24), 1.16 (6H, s, H-39

H-40).

¹³C-NMR (150 MHz, CDCl₃): δ 203.30 (C-12), 178.89 (C-8), 170.80 (C-30), 161.41 (C-18), 157.41 (C-16), 157.37 (C-6), 142.05 (C-37), 137.79 (C-27), 135.37 (C-10), 133.30 (C-9), 131.51 (C-33), 127.80 (C-28), 123.91 (C-3), 122.23 (C-32), 120.93 (C-36), 116.30 (C-4), 107.41 (C-17), 102.97 (C-5), 100.39 (C-7), 90.90 (C-14), 83.90 (C-23), 83.78 (C-13), 80.84 (C-2), 70.61 (C-38), 48.95 (C-22), 46.81 (C-11), 44.67 (C-20), 29.83 (C-25), 29.44 (C-39), 29.43 (C-40), 29.27 (C-26), 28.83 (C-24), 27.39 (C-19), 25.73 (C-35), 25.14 (C-21), 21.58 (C-31), 20.72 (C-29), 18.14 (C-34).

The EIMS data of Product Gh-3272 show [M−H₂O]⁴ (2) at m/z 626 and a base peak at m/z 545 (100), and the HRFABMS data of Product Gh-3272 show a pseudomolecular ion peak [M−H₂O+H] at m/z 627.2961, indicating that Product Gh-3272 has a molecular formula of C₃₆H₄₄O₉, which has sixteen more mass units than the molecular formula of gambogic acid. As compared to gambogic acid, the unsaturation number of Product Gh-3272 remains unchanged.

The ¹H-NMR and ¹³C-NMR data of Product Gh-3272 show that: Product Gh-3272 has a C-2 side chain attached different from that of gambogic acid, namely, a 4-hydroxy-4-methyl-2-pentenyl group in lieu of the 4-methyl-3-pentenyl group in gambogic acid.

The ¹H-NMR and ¹³C-NMR data of Product Gh-3272 also reveal that Product Gh-3272 has an oxygen-bearing quaternary carbon (δ 70.61) and two coupled olefinic protons (δ 5.59 (1H, d, J=15.7 Hz) and δ 5.53 (1H, dt, J=15.6, 6.9 Hz)). In view of the coupling constant (J) of 15.7 Hz, the olefinic group is a trans double bond (i.e., in an E configuration).

The ¹H-¹H COSY data of Product Gh-3272 show that: δ 5.53 (1H, dt, J=15.6, 6.9 Hz) is coupled not only to δ 5.59 (1H, d, J=15.7 Hz), but also to two methylene protons (δ 2.36 (H₁-20) and δ 2.25 (H₂-20)), evidencing that a trans-disubstituted double bond is located at C-36 and C-37.

The HMBC data of Product Gh-3272 show that: the methylene protons (δ 2.25 (H₂-20) and δ 2.36 (H₁-20)) are correlated with δ 27.39 (C-19), δ 80.84 (C-2), δ 120.93 (C-36) and δ 142.05 (C-37), as well as an olefinic carbon (δ 123.91 (C-3)) in a pyran ring; δ 5.53 (H-36) is correlated with δ 44.67 (C-20), δ 70.61 (C-38) and δ 142.05 (C-37); and δ 5.59 (H-37) is correlated with δ 44.67 (C-20), δ 70.61 (C-38), δ 120.93 (C-36), δ 29.44 (C-39) and δ 29.43 (C-40), evidencing that the side chain attached to C-2 is a 4-hydroxy-4-methyl-2-pentenyl group.

The NOESY data of Product Gh-3272 show that: δ 7.52 (H-10) is correlated with δ 3.46 (H-11); δ 3.46 (H-11) is correlated with δ 2.29 (H₁-21) and δ 1.37 (H₂-21); δ 1.37 (H₂-21) is correlated with δ 2.49 (H-22); δ 2.49 (H-22) is correlated with a gem-dimethyl group (δ 1.67 (H-25) and δ 1.27 (H-24)); and δ 6.03 (H-27) is correlated with δ 1.70 (H-29), evidencing that the stereostructure of Product Gh-3272 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. Besides, the olefinic proton (δ 5.53 (H-36)) is correlated not only with δ 5.59 (H-37) and the methylene protons (δ 2.36 (H₁-20) and δ 2.25 (H₂-20)), but also with the gem-dimethyl group (δ 1.16 (H-39 and H-40)), and another olefinic proton (δ 5.34 (H-3)) is correlated with δ 1.38 (H-19) and δ 2.25 (H₂-20), Since 51.38 (H-19) is correlated with δ 1.70 (H-29), C-2 is in an R configuration.

Based on the above information, Product Gh-3272 is identified to be a new compound having the following chemical structure:

Product Gh-3272 is identified by the name “formoxanthone H” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11R,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(3-methyl-2-butenyl)-11-(4-hydroxy-4-methyl-2E-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

33. Product Gh-3332:

Product Gh-3332, which was purified from eluate 5 of fraction 1, was determined to have the following properties:

Yellow powder; mp 102˜106° C.

EIMS m/z (relative intensity): 626 [M−H₂O]⁺ (5), 575 (2), 545 (100), 499 (2), 471 (1), 389 (4), 347 (4), 271 (3), 245 (5), 215 (15), 189 (5), 147 (2), 105 (3), 69 (2); HRFABMS [M−H₂O+H]⁺ m/z: 627.2966; calculated for C₃₈H₄₃O₈, 627.2958.

¹H-NMR (600 MHz, CDCl₃): δ 12.81 (1H, s, OH-6), 7.55 (1H, d, J=6.9 Hz, H-10), 6.83 (1H, dt, J=7.4, 1.3 Hz, H-27), 6.64 (1H, J=10.0 Hz, H-4), 5.68 (1H, d, J=8.4 Hz, H-37), 5.67 (1H, m, H-36), 5.44 (1H, d, J=10.0 Hz, H-3), 4.97 (1H, br t, J=6.2 Hz, H-32), 3.48 (1H, dd, J=6.8, 4.5 Hz, H-11), 3.28 (1H, dd, J=14.9, 8.9 Hz, H₁-31), 3.14 (1H, br dd, J=13.5, 3.4 Hz, H₂-31), 2.69 (1H, ddd, J=16.4, 6.2, 1.3 Hz, H₁-26), 2.52 (1H, d, J=9.3 Hz, H-22), 2.42 (1H, dd, J=14.3, 4.8 Hz, H₁-21), 2.32 (2H, m, H-20), 2.20 (1H, dd, J=16.3, 8.5 Hz, H₂-26), 1.71 (3H, s, H-34), 1.69 (3H, s, H-25), 1.61 (3H, s, H-35), 1.38 (3H, s, H-19), 1.37 (3H, s, H-39), 1.36 (1H, m, H₂-21), 1.33 (3H, s, H-40), 1.30 (3H, s, H-29), 1.27 (3H, s, H-24).

¹³C-NMR (150 MHz, CDCl₃): δ 203.38 (C-12), 178.82 (C-8), 169.45 (C-30), 161.28 (C-18), 157.69 (C-16), 157.35 (C-6), 141.00 (C-37), 136.22 (C-27), 135.59 (C-10), 133.32 (C-9), 131.48 (C-33), 128.43 (C-28), 125.06 (C-3), 122.22 (C-32), 121.48 (C-36), 116.22 (C-4), 108.22 (C-17), 102.82 (C-5), 100.33 (C-7), 91.06 (C-14), 83.85 (C-23), 83.55 (C-13), 80.41 (C-2), 71.65 (C-38), 49.14 (C-22), 46.72 (C-11), 43.61 (C-20), 29.84 (C-25), 29.53 (C-39), 29.23 (C-40), 28.81 (C-24), 28.63 (C-26), 26.48 (C-19), 25.74 (C-35), 24.95 (C-21), 21.70 (C-31), 18.16 (C-34), 11.96 (C-29).

The EIMS data of Product Gh-3332 show [M−H₂O]⁴ (5) at m/z 626 and a base peak at m/z 545 (100), and the HRFABMS data of Product Gh-3332 show a pseudomolecular ion peak [M−H₂O+H] at m/z 627.2966, indicating that Product Gh-3332 has a molecular formula identical to that of product Gh-3272, i.e., C₃₈H₄₄O₉, which has 16 more mass units than the molecular formula of gambogic acid or isogambogic acid. As compared to gambogic acid, the unsaturation number of Product Gh-3332 remains unchanged.

The EIMS, ¹H-NMR and ¹³C-NMR data of Product Gh-3332 are generally similar to those of Product Gh-3272, implying that Product Gh-3332 might be an isomer of Product Gh-3272. Besides, a comparison of the ¹H-NMR data of a C-20 substituent group (β 1.33 (3H, s, H-40), δ 1.37 (3H, s, H-39), δ 5.68 (1H, d, J=8.4 Hz, H-37) and δ 5.67 (1H, m, H-36)) of Product Gh-3332 with those of Product Gh-3272 reveals that A^(36,37) in Product Gh-3332 is in a Z configuration. Further, as compared to Product Gh-3272, in Product Gh-3332, H-27 has a significant downfield shift (δ_(H) 6.83, Δδ=0.8), and C-29 is influenced by the γ-effect to have an upfield shift (δ_(C) 11.96, Δδ=−8.76). As such, it is presumed that Δ^(27,28) in product Gh-3332 is in an E configuration.

Based on the above information, Product Gh-3332 is identified to be a new compound having the following chemical structure:

Product Gh-3332 is identified by the name “isoformoxanthone I” (IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(3-methyl-2-butenyl)-11-(4-hydroxy-4-methyl-2Z-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2E)-]).

34. Product Gh-3261:

Product Gh-3261, which was purified from eluate 1 of fraction 1, was determined to have the following properties:

Yellow powder; mp 103˜105° C.

EIMS m/z (relative intensity): 662 [M]⁺ (15), 647 (5), 603 (2), 545 (100), 517 (12), 499 (2), 389 (4), 347 (3), 295 (1), 245 (3), 215 (6), 189 (2), 147 (1), 105 (2), 69 (3), 59 (3); HREIMS [M]⁺ m/z: 662.3098; calculated for C₃₈H₄₆O₁₀, 662.3091.

¹H-NMR (600 MHz, CDCl₃): δ 12.73 (1H, s, OH-6), 7.49 (1H, d, J=7.0 Hz, H-10), 6.65 (1H, dd, J=10.2, 2.5 Hz, H-4), 5.54 (1H, br t, J=4.6 Hz, H-27), 5.36 (1H, d, J=10.3 Hz, H-3), 5.06 (1H, br s, H-32), 3.50 (1H, t, J=5.7 Hz, H-11), 3.39 (1H, m, H₁-26), 3.36 (1H, d, J=10.1 Hz, H-37), 3.27 (1H, dd, J=14.9, 7.4 Hz, H₁-31), 3.22 (1H, br dd, J=14.3, 4.7 Hz, H₂-31), 2.86 (1H, br d, J=14.1 Hz, H₂-26), 2.51 (1H, d, J=9.4 Hz, H-22), 2.33 (1H, dd, J=13.5, 4.7 Hz, H₁-21), 2.04 (1H, m, H₁-20), 1.74 (1H, m, H₁-36), 1.72 (3H, s, H-34), 1.68 (1H, m, H₂-20), 1.65 (3H, s, H-25), 1.64 (3H, s, H-35), 1.60 (3H, s, H-29), 1.459 (1H, m, H₂-36), 1.456 (3H, s, H-19), 1.39 (1H, dd, J=13.5, 9.6 Hz, H₂-21), 1.27 (3H, s, H-24), 1.21 (3H, s, H-39), 1.11 (3H, s, H-40).

¹³C-NMR (150 MHz, CDCl₃): 6203.34 (C-12), 179.20 (C-8), 168.78 (C-30), 161.13 (C-18), 157.75 (C-16), 157.43 (C-6), 136.34 (C-27), 134.74 (C-10), 133.91 (C-9), 131.41 (C-33), 128.56 (C-28), 124.18 (C-3), 122.33 (C-32), 116.18 (C-4), 107.80 (C-17), 102.49 (C-5), 100.63 (C-7), 90.57 (C-14), 84.03 (C-13), 83.64 (C-23), 81.24 (C-2), 78.23 (C-37), 73.70 (C-38), 49.01 (C-22), 47.02 (C-11), 38.73 (C-20), 29.92 (C-25), 29.87 (C-26), 29.05 (C-24), 27.88 (C-19), 26.70 (C-39), 25.70 (C-35), 25.28 (C-36), 25.25 (C-21), 24.28 (C-40), 21.71 (C-31), 20.85 (C-29), 18.22 (C-34).

The EIMS data of Product Gh-3261 show a molecular ion peak [M]⁺ at m/z 662 and a base peak at m/z 545 (100), and the HREIMS data of Product Gh-3261 show [M]⁺ at m/z 662.3098, indicating that Product. Gh-3261 has a molecular formula of C₃₈H₄₆O₁₀, which has thirty-four more mass units than the molecular formula of gambogic acid.

The ¹H-NMR, ¹³C-NMR and HMQC data of Product Gh-3261 show that Product Gh-3261 has a C-2 side chain different from that of gambogic acid, namely, a 3,4-dihydroxy-4-methylpentyl group in lieu of the 4-methyl-3-pentenyl group in gambogic acid. Besides, the ¹H-NMR and ¹³C-NMR data of Product Gh-3261 reveal that Product Gh-3261 has a secondary hydroxy group (δ 3.36 (1H, d, J=10.1 Hz) and δ 78.23) and an oxygen-bearing quaternary carbon (δ 73.70).

The ¹H-¹H COSY data of Product Gh-3261 show that: a hydroxymethine proton (δ 3.36 (1H, d, J=10.1 Hz)) is coupled to δ 1.459 (1H, m); δ 1.459 (1H, m) is coupled to δ 2.04 (1H, m, H₁-20); and four protons of two adjacent methylene groups at C-20 and C-36 (δ 2.04 (H₁-20), δ 1.68 (H₂-20) and δ 38.73 (C-20); and δ 1.74 (H₁-36), δ 1.459 (H₂-36) and δ 25.28 (C-36)] are coupled to each other, indicating that the hydroxymethine proton is H-37. As such, it can be known that a secondary hydroxy group is attached to C-37 (δ 78.23); a tertiary hydroxy group is attached to C-38 (δ 73.70); and C-39 (δ 26.70) and C-40 (δ 24.28) are tertiary methyl groups.

The HMBC data of Product Gh-3261 show that: the hydroxymethine proton (δ 3.36 (H-37)] is correlated with δ 38.73 (C-20); both δ 2.04 (H₁-20) and δ 1.68 (H₂-20) are correlated with δ 25.28 (C-36), δ 81.24 (C-2) and δ 124.18 (C-3); δ 5.36 (H-3) is correlated with δ 102.49 (C-5), δ 81.24 (C-2) and δ 27.88 (C-19); δ 1.456 (H-19) is correlated with δ 81.24 (C-2), δ 124.18 (C-3), δ 116.18 (C-4) and δ 38.73 (C-20); δ 1.21 (H-39) is correlated with δ 78.23 (C-37), δ 73.70 (C-38) and δ 24.28 (C-40); and δ 1.11 (H-40) is correlated with δ 78.23 (C-37), δ 73.70 (C-38) and δ 26.70 (C-39), evidencing that the side chain attached to C-2 is a 3,4-dihydroxy-4-methylpentyl group.

The NOESY data of Product Gh-3261 show that: δ 7.49 (H-10) is correlated with δ 3.50 (H-11); δ 3.50 (H-11) is correlated with δ 2.33 (H₁-21) and δ 1.39 (H₂-21); δ 1.39 (H₂-21) is correlated with δ 2.51 (H-22) and δ 1.27 (H-24); δ 2.51 (H-22) is correlated with δ 1.65 (H-25); and δ 5.54 (H-27) is correlated with δ 1.60 (H-29), evidencing that the stereostructure of Product Gh-3261 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, since δ 3.36 (H-37) is correlated with δ 1.21 (H-39) and δ 1.11 (H-40), while δ 1.456 (H-19) is correlated with δ 1.60 (H-29), C-2 is in an R configuration.

Based on the above information, Product Gh-3261 is identified to be a new compound having the following chemical structure:

Product Gh-3261 is identified by the name “formoxanthone J” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11R,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(3-methyl-2-butenyl)-11-(3,4-dihydroxy-4-methylpentyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

35. Product Gh-3271:

Product Gh-3271, which was purified from eluate 2 of fraction 1, was determined to have the following properties:

Yellow powder; mp 99˜102° C.

EIMS m/z (relative intensity): 662 [M]⁺ (14), 644 (5), 603 (4), 545 (100), 517 (15), 499 (3), 419 (4), 389 (6), 347 (5), 283 (5), 245 (6), 215 (11), 213 (5), 189 (5), 147 (4), 129 (4), 117 (5), 105 (8), 91 (7), 85.9 (12), 83.9 (19), 69 (11), 59 (8), 57 (11), 55 (11); HREIMS [M]⁺ m/z: 662.3097; calculated for C₃₈H₄₆O₁₀, 662.3091.

¹H-NMR (600 MHz, CDCl₃): δ 12.75 (1H, s, OH-6), 7.50 (1H, d, J=7.0 Hz, H-10), 6.65 (1H, d, J=10.0 Hz, H-4), 5.46 (1H, d, J=10.0 Hz, H-3), 5.39 (1H, ddd, J=10.7, 3.9, 1.4 Hz, H-27), 5.08 (1H, dd, J=7.2, 5.9 Hz, H-32), 3.50 (1H, m, H-11), 3.49 (1H, m, H₁-26), 3.38 (1H, dd, J=10.5, 1.9 Hz, H-37), 3.28 (1H, br dd, J=15.1, 5.6 Hz, H₁-31), 3.23 (1H, dd, J=15.0, 7.4 Hz, H₂-31), 2.83 (1H, ddd, J=15.8, 3.9, 2.4 Hz, H₂-26), 2.50 (1H, d, J=9.4 Hz, H-22), 2.34 (1H, dd, J=13.5, 4.7 Hz, H₁-21), 2.05 (1H, m, H₁-20), 1.71 (3H, s, H-34), 1.68 (1H, m, H₁-36), 1.64 (3H, s, H-35), 1.63 (3H, s, H-25), 1.62 (1H, m, H₂-20), 1.58 (3H, s, H-29), 1.52 (1H, m, H₂-36), 1.44 (3H, s, H-19), 1.37 (1H, dd, J=13.5, 9.5 Hz, H₂-21), 1.27 (3H, s, H-24), 1.18 (6H, s, H-39, H-40).

¹³C-NMR (150 MHz, CDCl₃): δ 203.26 (C-12), 179.32 (C-8), 168.56 (C-30), 160.44 (C-18), 157.89 (C-16), 157.53 (C-6), 135.74 (C-27), 134.69 (C-10), 133.85 (C-9), 131.67 (C-33), 129.00 (C-28), 125.28 (C-3), 122.40 (C-32), 116.13 (C-4), 108.14 (C-17), 102.95 (C-5), 100.68 (C-7), 90.47 (C-14), 84.20 (C-13), 83.57 (C-23), 80.56 (C-2), 78.09 (C-37), 73.63 (C-38), 49.07 (C-22), 47.05 (C-11), 36.88 (C-20), 29.99 (C-26), 29.86 (C-25), 29.11 (C-24), 26.39 (C-19), 25.89 (C-39), 25.66 (C-35), 25.56 (C-36), 25.22 (C-21), 23.40 (C-40), 21.76 (C-31), 20.81 (C-29), 18.07 (C-34).

The EIMS data of Product Gh-3271 show a molecular on peak [M]⁺ at m/z 662 and a base peak at m/z 545 (100), and the HREIMS data of product Gh-3271 show [M]⁺ at m/z 662.3097, indicating that Product Gh-3271 has a molecular formula of C₃₈H₄₆O₁₀, which has thirty-four more mass units than the molecular formula of gambogic acid.

The ¹H-NMR, ¹³C-NMR and HMQC data of Product Gh-3271 show that Product Gh-3271 has a C-2 side chain different from that of gambogic acid, namely, a 3,4-dihydroxy-4-methylpentyl group in lieu of the 4-methyl-3-pentenyl in gambogic acid. Besides, the ¹H-NMR and ¹³C-NMR data of Product Gh-3271 show that Product Gh-3271 has a secondary hydroxy group (δ 3.38 (1H, dd, J=10.5, 1.9 Hz) and δ 78.09) and an oxygen-bearing quaternary carbon (δ 73.63).

The ¹H-¹H COSY data of Product Gh-3271 show that: a hydroxymethine proton (δ 3.38 (1H, dd, J=10.5, 1.9 Hz)) is coupled to δ 1.52 (1H, m); δ 1.52 (1H, m) is coupled to δ 2.05 (1H, m, H₁-20); and two adjacent methylene protons (δ 2.05 (H₁-20), δ 1.62 (H₂-20), δ 1.68 (H₁-36), and δ 1.52 (H₂-36)) are coupled to each other, evidencing that the hydroxymethine proton is H-37.

The HMQC data of Product Gh-3271 show that: δ 36.88 (C-20), δ 25.56 (C-36), and δ 73.63 (C-38), evidencing that the secondary hydroxy group is attached to C-37, and a tertiary hydroxy group is attached to C-38.

The HMBC data of Product Gh-3271 show that; δ 3.38 (H-37) is correlated with δ 36.88 (C-20); both δ 2.05 (H₁-20) and δ 1.62 (H₂-20) are correlated with δ 25.56 (C-36), δ 78.09 (C-37), δ 80.56 (C-2), δ 125.28 (C-3) and δ 26.39 (C-19); δ 5.46 (H-3) is correlated with δ 80.56 (C-2), δ 26.39 (C-19) and δ 102.95 (C-5); δ 1.44 (H-19) is correlated with δ 80.56 (C-2), δ 125.28 (C-3), δ 116.13 (C-4) and δ 160.44 (C-18); and δ 1.18 (H-39 and H-40) is correlated with δ 78.09 (C-37) and δ 73.63 (C-38), evidencing that the side chain attached to C-2 is a 3,4-dihydroxy-4-methylpentyl group.

The NOESY data of Product Gh-3271 show that: δ 7.50 (H-10) is correlated with δ 3.50 (H-11); δ 3.50 (H-11) is correlated with δ 2.34 (H₁-21) and δ 1.37 (H₂-21); δ 1.37 (H₂-21) is correlated with δ 2.50 (H-22) and δ 1.27 (H-24); δ 2.50 (H-22) is correlated with δ 1.63 (H-25); and δ 5.39 (H-27) is correlated with δ 1.58 (H-29), evidencing that the stereostructure of Product Gh-3271 in this part is identical to that of gambogic acid, i.e., in a 11S,13R,14S,22S configuration, which includes H-27 and carboxyl group (C-30) in a trans relationship, and a double bond Δ^(27,28) in a Z configuration. In addition, since δ 3.38 (H-37) is correlated with δ 1.18 (H-39 and H-40), and δ 2.05 (H₁-20) is correlated with δ 1.58 (H-29), C-2 is in an S configuration.

Based on the above information, Product Gh-3271 is identified to be a new compound having the following chemical structure:

Product Gh-3271 is identified by the name “epiformoxanthone J” {IUPAC nomenclature: [2-butenoic acid, 2-methyl-4-[(1R,3aS,5S,11S,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(3-methyl-2-butenyl)-11-(3,4-dihydroxy-4-methylpentyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3.4-g]pyrano[3.2-b]xanthen-1-yl]-,(2Z)—]}.

Conclusion:

According to the experimental results obtained above, the thirty-five products purified from fractions 1-3 are found to include 17 new compounds and 18 known compounds, as summarized in the following Table 4. Inasmuch as Products Gh-47, Gh-631, Gh-4601, Gh-4602 and Gh-2301 are found to be known compounds, the in vitro anti-cancer activities of which had been tested in U.S. Pat. No. 7,138,428 B2, these five products are not tested in the following pharmacological experiments.

TABLE 4 Thirty-five products purified from fractions 1-3 Product no. Nomenclature New compounds Gh-2607-B Formoxanthone B Gh-2607-1A Epiformoxanthone B Gh-2508 β-Gambogellic acid Gh-2507 β-Epigambogellic acid Gh-1631 Formoxanthone C Gh-1050 3α-Hydroxygambogellic acid Gh-3291 Formoxanthone D Gh-3352 Formoxanthone E Gh-3351 Epiformoxanthone E Gh-1052 Formoxanthone F Gh-1036 Epiformoxanthone F Gh-3353 Formoxanthone G Gh-3311 Epiformoxanthone G Gh-3272 Formoxanthone H Gh-3332 Isoformoxanthone I Gh-3261 Formoxanthone J Gh-3271 Epiformoxanthone J Known compounds Gh-47 Isomorellic acid Gh-631 Formoxanthone A Gh-4601 Isomorellinol Gh-4602 Morellic acid Gh-2301 Desoxymorellin Gh-4301 Desoxygambogenin Gh-2605 Gambogic acid Gh-2606 Eepigambogic acid Gh-1641 Isogambogic acid Gh-1642 Epiisogambogic acid Gh-2603-2 Gambogellic acid Gh-2603-1 Epigambogellic acid Gh-2501 Isomorellin Gh-2505 Gambogenic acid Gh-2642 Isogambogenic acid Gh-1601-A 30-Hydroxygambogic acid Gh-1602 30-Hydroxyepigambogic acid Gh-2641-1 Neogambogic acid

Example 4 Preparation of Fractionated Products TSB-14a to TSB-14E from the Product TSB-14 A. Semi-Preparative RP-HPLC of the Product TSB-14

3 g of the product TSB-14, which was an acetone-extracted product from gamboge resin prepared according to Example 1 of U.S. Pat. No. 7,138,428 B2, was dissolved in 30 mL of acetone/acetonitrile (v/v=1:9) and then subjected to a semi-preparative RP-HPLC analysis along the lines as described in the previous section of “General Procedures,” in which a mobile phase containing A (an aqueous mixture of 0.0475% TFA and 5% acetonitrile) and B (95% acetonitrile) was used, and a gradient elution was performed by ranging the ratio of A from 40% to 32%, and that of B from 60% to 68% within 100 minutes. The elution profile thus obtained is shown in FIG. 6.

B. Preparation of Five Crude Fractionated Products from the Product TSB-14

Referring to FIG. 6, the semi-preparative RP-HPLC elution profile as shown therein was divided into five regions: Region A, which corresponds to a retention period ranging from 0 to 13.7 minutes; Region B, which corresponds to a retention period ranging from 13.7 to 20.4 minutes; Region C, which corresponds to a retention period ranging from 20.4 to 26.1 minutes; Region D, which corresponds to a retention period ranging from 26.1 to 34.9 minutes; and Region E, which corresponds to a retention period ranging from 34.9 to 53.8 minutes.

3 g of the product TSB-14 was subjected to a semi-preparative RP-HPLC analysis as described in the preceding section A, and five eluates that respectively correspond to Regions A to E of the elution profile shown in FIG. 6 were collected.

In order to obtain eluates A-E in large amount, elution of the product TSB-14 by the semi-preparative RP-HPLC analysis as described above was repeated for 50 times. Eluates A-E thus collected were individually placed into a 4 L brown glass bottle, followed by concentrating in a vacuum rotatory evaporator, to thereby give concentrates A-E, each of which was in turn treated as follows: partitioning a concentrate in H₂O and ethyl acetate; after washing with H₂O so as to remove TFA, the organic layer was dried on anhydrous Na₂SO₄, filtered, and the organic solvent was removed using a vacuum rotatory evaporator. Thereafter, five crude fractionated products A-E were obtained from eluates A-E, respectively.

C. Refining of the Five Crude Fractionated Products A-E

The five crude fractionated products A-E were refined as follows: a crude fractionated product as obtained above was dissolved in 10 mL of acetone and then subjected to a semi-preparative RP-HPLC analysis along the lines as described in the previous section of “General Procedures,” in which a mobile phase containing 0.05% TFA_((aq.)) and 95% acetonitrile was used, and a gradient elution was performed according to the elution conditions shown in Table 5.

TABLE 5 Elution conditions used in the refining of the five crude fractionated products A-E Crude fractionated product Elution Conditions A Within 80 minutes, ranging the ratio of 0.05% TFA_((aq.)) from 58% to 40%, and that of 95% acetonitrile from 42% to 60%. B Within 80 minutes, ranging the ratio of 0.05% TFA_((aq.)) from 70% to 40%, and that of 95% acetonitrile from 30% to 60%. C Within 80 minutes, ranging the ratio of 0.05% TFA_((aq.)) from 56% to 40%, and that of 95% acetonitrile from 44% to 60%. D Within 80 minutes, ranging the ratio of 0.05% TFA_((aq.)) from 52% to 40%, and that of 95% acetonitrile from 48% to 60%. E Within 80 minutes, ranging the ratio of 0.05% TFA_((aq.)) from 48% to 40%, and that of 95% acetonitrile from 52% to 60%.

During the gradient elution, eluates from the five crude fractionated products A-E were collected with reference to Regions A-E of the semi-preparative RP-HPLC elution profile shown in FIG. 6. Each of the eluates thus collected was then treated as follows: partitioning an eluate in H₂O and ethyl acetate; after washing with H₂O so as to remove TFA, the organic layer was dried on anhydrous Na₂SO₄, filtered, and the organic solvent was removed using a vacuum rotatory evaporator. Thereafter, five partially refined fractionated products were obtained.

Each of the five partially refined fractionated products thus obtained was further refined by repeating the semi-preparative RP-HPLC analysis as described in this section until a consistent elution profile was obtained. After refining, five fractioned products from the product TSB-14 were obtained, i.e., TSB-14A (125 mg), TSB-14B (85 mg), TSB-14C (52 mg), TSB-14D (267 mg), and TSB-14E (1026 mg).

D. Identification and Characterization of Products TSB-14A to TSB-14E

10 mg of each of the fractionated Products TSB-14A to TSB-14E as obtained in the preceding section C was dissolved in 1 mL of acetone, followed by subjecting to a semi-preparative RP-HPLC analysis as described in the preceding section C. The elution profiles of the fractionated Products TSB-14A to TSB-14E thus obtained are shown in FIGS. 7-11.

Comparing the elution profiles shown in FIGS. 7-11 with that of FIG. 1, it can be noted that the elution profiles of the fractionated Products TSB-14A to TSB-14E contain peaks that correspond to peaks 1-12, peaks 13-15, peaks 16-20, peaks 21-24, and peaks 25-35 shown in FIG. 1, respectively, indicating that the fractionated product TSB-14A contains Products Gh-3261, Gh-3271, Gh-3272, Gh-3311, Gh-3332, Gh-1036, Gh-3291, Gh-631, Gh-1052, Gh-3351, Gh-3353 and Gh-3352; the fractionated product TSB-14B contains Products Gh-47, Gh-4602 and Gh-4601; the fractionated product TSB-14C contains Products Gh-1601-A, Gh-1050, Gh-1602, Gh-1631 and Gh-2641-1; the fractionated product TSB-14D contains Products Gh-2501, Gh-2642, Gh-2507 and Gh-2505; and the fractionated product TSB-14E contains Products Gh-2508, Gh-2603-1, Gh-2603-2, Gh-1641, Gh-1642, Gh-2605, Gh-2606, Gh-2607-B, Gh-2607-1A, Gh-2301 and Gh-4301.

Example 5 Pharmacological experiments of the product TSB-14

In order to explore the possible biological activity of the product TSB-14 other than the tumor cell growth inhibitory activity as disclosed in U.S. Pat. No. 7,138,428 B2, the following pharmacological experiments were performed.

Pharmacological Exp. 1 The Effect of a Formulation Containing the

Product TSB-14 Upon the Activity or Binding Ability of Cancer-Related Proteins A formulation TSB-9 was obtained by mixing the product TSB-14 with brown sugar in a ratio of 9:1 (wt/wt). The influence of the formulation TSB-9 upon the activity or binding ability of cancer-related proteins was analyzed by the MDS Pharma Services with reference to D. Riendeau et al. (1997), Can. J. Physiol. Pharmacol., 75:1088-1095; T. D. Warner et al. (1999), Proc. Natl. Acad. Sci. USA, 96:7563-7568; C. Ditchfiled et al. (2003), J. Cell Biol., 161:267-280; N. Gray et al. (1999), Curr. Med. Chem., 6:859-875; K. Cheng and J. G. Koland (1996), J. Biol. Chem., 271:311-318; K. Farley et al. (1992), Anal. Biochem., 203:151-157; E. Buchdunger et al. (1996), Cancer Res., 56:100-104; D. Q. Guo et al. (2000), J. Biol. Chem., 275:11216-11221; E. G. Barbacci et al. (2003), Cancer Res., 63:4450-4459; E. Liu et al. (1992), Oncogene, 7:1027-1032, T. Ozawa et al. (1998), Anal. Chem., 70:2345-2352; and J. D. Obourn et al. (1993), Biochem., 32:6229-6236, with minor modifications to the assays reported therein.

Briefly, in this experiment, the formulation TSB-9 was tested at a concentration of 10 μg/mL, using nine cancer-related proteins as follows: cyclooxygenase-2 (COX-2); protein serine/threonine kinases AURKB (Aurora-B kinase) and CDC2/CCNB1 (cdk1/cyclin B); protein tyrosine kinases ABL1 (ABL), epidermal growth factor receptor (EGFR), ERBB2 (HER2), insulin receptor and KDR (VEGFR-2); and estrogen receptor cc (ERα). The biofunctions of these nine targets and their correlation with the type of cancer are outlined in Table 6.

TABLE 6 Cancer-related proteins tested in pharmacological experiment 1 Cancer-related protein Biofunction Cancer type Cyclooxygenase-2 Inducing inflammation; Colorectal promoting tumor growth; cancer and inhibiting apoptosis of tumor gastric cancer cells Protein Regulating cell division, and Non-small cell lung serine/threonine resulting in abnormal cancer, brain cancer, kinase, AURKB chromosome number when and thyroid cancer (Aurora-B kinase) over-expressed; promoting carcinogenesis Protein Regulating cell division, and Nasopharyngral serine/threonine resulting in uncontrolled cell cancer kinase, division when over-expressed; CDC2/CCNB1 promoting carcinogenesis (cdk1/cyclin B) Protein Promoting cancer cell growth Chronic myelocytic tyrosine kinase, leukemia and T-cell ABL1 (ABL) acute lymphoblastic leukemia Protein Activating the signal pathway, Lung cancer and tyrosine kinase, promoting cell proliferation colon cancer EGFR Protein Activating the signal pathway, Breast cancer and tyrosine kinase, promoting cell proliferation leukemia ERBB2 (HER2) Protein Activating the signal pathway Breast cancer, colon tyrosine kinase, when combined with insulin; cancer, lung cancer, insulin receptor promoting cell proliferation; liver cancer, and inhibiting cell apoptosis ovarial cancer Protein Promoting angiogenesis and Breast cancer, lung tyrosine kinase, tumor growth cancer, liver cancer, KDR (VEGFR-2) renal cancer, and pancreas cancer Estrogen Promoting cell proliferation Breast cancer, lung receptor α cancer, and endometrial cancer

According to the experimental reports provided by the MDS Pharma Services, the influence of the formulation TSB-9 upon the activity or binding ability of the nine tested cancer-related proteins was expressed as inhibition rate (%) and the obtained results are summarized in Table 7.

TABLE 7 The influence of the formulation TSB-9 upon the activity or binding ability of the nine tested cancer-related proteins Tested target Inhibition rate (%) cyclooxygenase-2 83 Protein serine/threonine kinase, AURKB 96 (Aurora-B kinase) Protein serine/threonine kinase, 94 CDC2/CCNB1 (cdk1/cyclin B) Protein tyrosine kinase, ABL1 (ABL) 99 Protein tyrosine kinase, EGFR 94 Protein tyrosine kinase, ERBB2 (HER2) 86 Protein tyrosine kinase, insulin receptor 100 Protein tyrosine kinase, KDR (VEGFR-2) 99 Estrogen receptor α 66

According to the results shown in Table 7, it is evident that the acetone-extracted product TSB-14 from gamboge resin exhibits a significant inhibitory activity upon the tested cancer-related proteins. Inasmuch as these nine cancer-related proteins are known to be associated with various tumors/cancers (e.g., colorectal cancer, gastric cancer, non-small cell lung cancer, brain cancer, thyroid cancer, nasopharyngral cancer, chronic myelocytic leukemia, T-cell acute lymphoblastic leukemia, lung cancer, colon cancer, breast cancer, leukemia, liver cancer, ovarial cancer, renal cancer, pancreas cancer, and endometrial cancer), it is contemplated that the acetone-extracted product TSB-14 from gamboge resin can be used in the treatment of tumors/cancers.

Pharmacological Exp. 2 In Vivo Analgesia Test

The formulation TSB-9 was milled to obtain a formulation TSB-9-W having a particle size of around 10 μm, and an in vivo analgesia test of the formulation TSB-9-W was performed by the MDS Pharma Services.

Briefly, male CD-1 (Crl.) mice were randomly divided into three groups (n=5 for each group) including an experimental group (i.e., TSB-9-W group) and two control groups (i.e., a vehicle normal control group and a morphine positive control group). The mice in the TSB-9-W group were orally administered with the formulation TSB-9-W at a dose of 100 mg/Kg, the mice in the vehicle normal control group were orally administered with 2% Tween 80 at a dosing volume of 10 mL/Kg, and the mice in the morphine positive control group were orally administered with morphine at a dose of 30 mg/Kg. One hour later, 0.02 mL of a 2% formalin solution was subplantarly injected into the hind paws of mice in each group, and the hind paw licking times for each mouse were counted at the time intervals of 0-5 minutes and 15-30 minutes after formalin injection. Inhibition rate (%) of hind paw licking in each group of mice was calculated using the following Equation (1):

A=(B−C)/B×100  (1)

wherein A=inhibition rate of hind paw licking (%),

-   -   B=the average value of the hind paw licking times in the vehicle         normal control group of mice, and     -   C=the average value of the hind paw licking times in each group         of mice.

If the calculated inhibition rate is ≧50%, it is an indication that a significant analgesic activity exists.

The obtained experimental results are shown in Table 8. Referring to Table 8, as compared to the mice in the vehicle normal control group, the inhibition rate of hind paw licking calculated for the TSB-9-W group of mice was significantly increased at the intervals of 0-5 minutes and 15-30 minutes after formalin injection. In particular, during the interval of 0-5 minutes, the hind paw licking in the TSB-9-W group of mice was inhibited by 68%, indicating that the acetone-extracted product TSB-14 from gamboge resin is effective to inhibit pain.

TABLE 8 Inhibition rate of hind paw licking with respect to mice in each tested group 0-5 minutes after 15-30 minutes after formalin injection formalin injection Group Inhibition rate of hind paw licking (%) Vehicle normal control 0  0 TSB-9-W 68* 43 Morphine positive control 100*  100* *An inhibition rate ≧50% indicates the existence of a significant analgesic activity.

Pharmacological Exp. 3 In Vivo Anti-Inflammation Test

The formulation TSB-9 was milled to obtain a formulation TSB-9-W1 having a particle size of around 5 μm, and an in vivo anti-inflammation test of the formulation TSB-9-W1 was performed by the MDS Pharma Services.

Briefly, male Wistar rats with a weight of around 160±5 g were randomly divided into four groups (n=5 for each group) including two experimental groups (i.e., TSB-9-W1-1 group and TSB-9-W1-2 group) and two control groups (i.e., a vehicle normal control group and an aspirin positive control group). After overnight fasting, the rats in the TSB-9-W1-1 and the TSB-9-W1-2 groups were orally administered with the formulation TSB-9-W1 at a dose of 10 mg/Kg and a dose of 30 mg/Kg, respectively, the rats in the vehicle normal control group were orally administered with 2% Tween 80 at a dosing volume of 10 mL/Kg, and the rats in the aspirin positive control group were orally administered with aspirin at a dose of 150 mg/Kg. One hour later, 0.1 mL of a 1% carrageenan suspension was intraplantarly injected into the right hind paws of rats in each group. Three hours after the intraplantar injection, the volumes of the left and right hind paws of each rat were measured using a plethysmometer (#7150, UGO Basile, Italy) including a water cell (a diameter of 25 mm; #7157, UGO Basile, Italy), and the hind paw edema volume was expressed as the difference between the measured volumes of the left and right hind paws. Inhibition rate (%) of hind paw edema in each group of rats was calculated using the following Equation (2):

D=(E−F)/E×100  (2)

wherein D=inhibition rate of hind paw edema,

-   -   E=the average value of the hind paw edema volumes in the vehicle         normal control group of rats, and     -   F=the average value of the hind paw edema volumes in each group         of rats.

If the calculated inhibition rate is 30%, it is an indication that a significant anti-inflammatory activity exists.

The obtained experimental results are shown in Table 9. Referring to Table 9, as compared to the rats in the vehicle normal control group, the inhibition rates of hind paw edema calculated for the TSB-9-W1-1 group and TSB-9-W1-2 group of rats were significantly increased three hours after carrageenan injection. Specifically, the hind paw edema was inhibited by 30% in rats administered with the formation TSB-9-W1 at a dose of 30 mg/Kg. The experimental results reveal that the acetone-extracted product TSB-14 from gamboge resin has a dosage-dependent anti-inflammatory effect.

TABLE 9 Inhibition rate of hind paw edema in each of group of rats Group Inhibition rate of hind paw edema (%) Vehicle normal control 0 TSB-9-W1-1 17  TSB-9-W1-2 30* Aspirin positive control 40* *An inhibition rate ≧30% indicates the existence of a significant anti-inflammatory activity.

Example 6 Pharmacological Experiments of the Fractioned Products and the Purified Compounds Obtained from the Product TSB-14

In order to explore the possible biological activities of the five fractioned products TSB-14A to TSB-14E obtained in the above Example 4 and the purified products obtained in the above Example 2 (excluding Products Gh-47, Gh-631, Gh-4601, Gh-4602 and Gh-2301), the following pharmacological experiments were performed by the MDS Pharma Services.

Pharmacological Exp. 1 In Vitro Anti-Cancer Test

The in vitro anti-cancer test was primarily used to detect the effect of a candidate drug on cancer cell proliferation. The working principle involved therein is the ability of viable cells to shift alamarBlue (AbD Serotec, UK) from its originally non-fluorescent oxidized state (non-fluorescent, blue) to a reduced form (fluorescent, red) having fluorescence via metabolic reaction. According to the fluorescent data result generated by the alamarBlue reagent thus obtained, the proliferation of the viable cells and cell activity can be quantified for detection.

In the in vitro anti-cancer tests, a candidate drug was tested at 5 different concentrations of 0.01, 0.1, 1, 10, and 100 μg/ml, and six human cancer cell lines and a normal human cell line were used (see Table 10). In addition, 40% dimethylsulfoxide (DMSO) was used as a normal control, and mitomycin was used as a positive control.

TABLE 10 Cell lines used in the in vitro anti-cancer tests Cell line Source Human breast adenocarcinoma cell MCF7 ATCC HTB-22 Human colon adenocarcinoma cell HT-29 ATCC HTB-38 Human promyelocytic leukemia cell HL-60 ATCC CCL-240 Human hepatocellular carcinoma cell HepG2 ATCC HB-8065 Human lung carcinoma cell A549 ATCC CCL-185 Human histocytic lymphoma cell U937 ATCC CRL-1593 Human umbilical venal epithelial cell (HUVEC) ATCC CRL-1730

According to the experimental reports provided by the MDS Pharma Services, IC₅₀ (50% inhibition concentration) and LC₅₀ (50% lethal concentration) of the five fractioned products TSB-14A to TSB-14E obtained in the above Example 4 and the thirty purified products obtained in the above Example 2 are shown in Tables 11-14, respectively.

TABLE 11 IC₅₀ (μg/mL) of the fractionated products TSB-14A to TSB-14E with respect to cancer cells Cell line Tested prouct MCF-7 HT-29 HL-60 HepG2 A549 U937 HUVEC TSB-14A 1.8 9.8 0.41 4.8 2.2 0.21 0.7 TSB-14B 0.38 1.4 0.53 2.1 0.50 0.48 0.16 TSB-14C 0.55 2.0 0.14 1.5 0.68 0.14 0.22 TSB-14D 0.15 0.81 0.20 1.1 0.22 0.16 0.17 TSB-14E 0.074 1.2 0.11 0.88 0.18 0.23 0.36 Mitomycin (μM) 0.033 0.15 0.16 0.042 0.23 0.23 0.56

TABLE 12 LC₅₀ (μg/mL) of the fractionated products TSB-14A to TSB-14E resin with respect to cancer cells Cell line Tested product MCF-7 HT-29 HL-60 HepG2 A549 U937 HUVEC TSB-14A 8.5 37 5.6 27.1 6.4 1.0 15.4 TSB-14B 9.3 17 3.3 12.8 3.8 0.74 1.7 TSB-14C 4.8 5.8 1.9 4.5 4.3 0.36 1.9 TSB-14D 2.0 10 3.3 5.3 0.62 0.40 1.5 TSB-14E 0.49 3.8 0.77 3.6 0.51 0.44 1.3 Mitomycin (μM) >10 >10 0.93 4.5 5.6 0.91 6.9

TABLE 13 IC₅₀ (μg/mL) of thirty purified products obtained in Example 2 with respect to cancer cells Cell line Tested product MCF-7 HT-29 HL-60 HepG2 A549 U937 HUVEC Gh-3353 2.4 5.0 1.3 5.3 2.6 4.8 5.5 Gh-3271 0.16 1.8 3.0 0.46 0.25 0.11 0.42 Gh-3311 8.0 7.9 1.4 7.9 5.0 1.9 4.0 Gh-3261 0.36 1.1 1.9 1.0 0.19 0.11 0.29 Gh-3351 0.99 1.9 11.7 2.9 0.77 0.24 0.11 Gh-3272 0.73 0.36 1.7 1.2 1.7 0.16 0.12 Gh-3332 0.87 0.85 11.8 6.7 1.3 0.23 0.11 Gh-3291 0.45 0.081 4.5 0.65 0.62 0.22 0.34 Gh-2507 0.19 1.6 0.20 1.7 0.13 0.45 0.41 Gh-2508 0.087 1.8 0.28 1.9 0.16 0.28 0.52 Gh-1050 0.14 4.8 0.17 1.1 0.13 0.21 0.78 Gh-1631 0.14 6.1 0.19 0.85 0.14 0.18 0.58 Gh-2641-1 0.20 2.6 0.18 1.7 0.15 0.26 0.54 Gh-1036 0.35 1.4 0.45 0.88 0.22 0.29 0.46 Gh-1052 0.52 1.6 0.23 1.2 0.46 0.22 0.47 Mitomycin (μM) 0.79 0.099 0.13 0.47 0.35 0.18 0.37 Gh-2505 1.9 2.1 0.75 2.1 0.62 1.1 0.28 Gh-2501 1.3 2.1 1.0 2.2 0.61 0.90 0.26 Mitomycin (μM) 0.069 0.39 0.048 0.053 0.11 0.050 0.14 Gh-4301 19 13 3.5 12 0.51 11 0.29 Mitomycin (μM) 0.089 0.50 0.078 0.069 0.097 0.059 0.075 Gh-2603-1 2.2 1.6 1.0 1.0 0.036 1.3 0.26 Gh-2603-2 2.2 1.4 0.93 0.65 0.20 1.5 0.14 Gh-2605 4.4 0.18 0.17 0.23 0.12 0.76 0.098 Gh-2606 1.3 0.39 0.66 0.38 0.10 0.41 0.11 Gh-2607-B + 1.4 0.94 0.90 1.1 0.091 0.84 0.15 Gh-2607-1A Mitomycin (μM) 0.15 0.49 0.098 0.11 0.099 0.072 0.12 Gh-1641 1.7 1.4 8.0 0.86 0.47 9.4 0.18 Gh-1642 2.4 1.9 6.0 1.1 0.51 8.8 0.18 Mitomycin (μM) 0.080 0.51 0.062 0.075 0.15 0.098 0.10 Gh-2642 3.0 12 9.0 11 1.5 1.3 2.4 Mitomycin (μM) 0.13 0.57 0.12 0.062 0.24 0.17 0.13 Gh-1602 0.27 0.94 1.0 1.3 0.40 0.14 0.25 Mitomycin (μM) 0.079 0.37 0.20 0.073 0.21 0.19 0.088 Gh-2607-B 0.10 0.30 0.13 0.31 0.10 0.10 0.07 Gh-2607-1A 0.12 0.24 0.49 0.43 0.19 0.15 0.43 Gh-1601-A 0.72 0.17 0.56 1.3 0.11 0.09 0.19 Gh-3352 0.075 0.18 0.26 0.16 0.18 0.11 0.084 Mitomycin (μM) 0.15 0.11 0.24 0.21 0.098 0.18 0.15

TABLE 14 LC₅₀ (μg/mL) of thirty purified products obtained in Example 2 with respect to cancer cells Cell line Tested product MCF-7 HT-29 HL-60 HepG2 A549 U937 HUVEC Gh-3353 9.6 20.8 2.4 35.5 8.2 14.6 8.4 Gh-3271 0.62 5.8 17.1 4.6 0.51 0.35 1.5 Gh-3311 14.0 38.0 2.2 25.6 21.2 5.4 13.9 Gh-3261 2.8 3.9 7.0 2.8 0.50 0.31 1.4 Gh-3351 3.8 72.6 22.1 31.2 3.4 0.62 3.3 Gh-3272 2.8 6.6 5.1 3.7 4.7 0.43 2.5 Gh-3332 3.3 73.8 30.5 19.6 4.6 1.4 3.3 Gh-3291 2.8 4.7 30.0 8.7 3.3 0.61 1.4 Gh-2507 2.2 8.6 5.3 7.1 0.53 2.7 21.0 Gh-2508 1.7 5.5 6.6 5.9 0.46 2.2 5.4 Gh-1050 1.0 7.7 7.0 3.8 0.74 2.3 3.4 Gh-1631 0.87 8.3 4.1 3.7 0.20 0.86 2.3 Gh-2641-1 3.5 6.8 4.5 4.6 0.22 1.0 4.3 Gh-1036 3.8 12.0 3.1 8.6 0.52 0.81 4.8 Gh-1052 2.4 5.7 3.4 4.0 2.5 0.69 3.1 Mitomycin (μM) >10 8.9 1.3 4.7 4.0 0.75 8.3 Gh-2505 19 4.4 7.2 6.5 12 3.7 2.3 Gh-2501 3.7 4.0 4.0 4.5 2.1 3.1 1.8 Mitomycin (μM) 6.4 5.6 0.81 1.8 2.0 1.1 1.4 Gh-4301 56 42 >100 51 6.2 >100 1.3 Mitomycin (μM) 5.8 7.8 2.5 2.6 2.1 3.3 8.5 Gh-2603-1 4.2 3.7 2.9 3.3 0.34 3.1 1.7 Gh-2603-2 4.2 3.9 2.4 3.5 0.47 3.6 1.7 Gh-2605 5.9 0.61 2.9 3.5 0.37 2.9 1.6 Gh-2606 1.6 2.0 2.4 3.0 0.31 3.1 1.4 Gh-2607-B + 2.2 2.1 2.7 2.5 0.51 2.7 1.4 Gh-2607-1A Mitomycin (μM) 1.8 9.3 1.3 1.3 1.9 2.0 6.6 Gh-1641 33 4.4 32 4.5 3.0 36 1.3 Gh-1642 29 4.8 35 5.3 2.8 33 1.3 Mitomycin (μM) 5.8 8.5 1.2 2.3 3.6 1.9 2.4 Gh-2642 10 42 32 29 4.6 4.1 11 Mitomycin (μM) >10 >10 2.3 1.6 4.5 0.87 2.4 Gh-1602 4.0 4.2 3.3 3.5 3.7 0.69 0.94 Mitomycin (μM) >10 >10 1.8 2.4 5.3 0.82 1.7 Gh-2607-B 0.68 1.0 3.1 4.0 0.33 0.25 1.6 Gh-2607-1A 1.5 0.84 2.6 3.9 0.45 0.37 1.5 Gh-1601-A 4.4 0.77 3.0 4.1 6.6 0.28 5.4 GH-3352 1.8 0.68 0.93 2.0 0.99 0.26 0.85 Mitomycin (μM) 17 22 0.89 5.2 4.4 0.85 1.8

It can be known from the results shown in Tables 11-14 that the five fractionated products TSB-14A to TSB-14E obtained in the above Example 4 and the seventeen new compounds obtained in the above Example 2 all have significant effects in inhibiting the growth of tumor/cancer cells and killing tumor/cancer cells. In particular, the anti-cancer effects of the fractionated products TSB-14A to TSB-14E are generally better than that of the product TSB-14 disclosed in U.S. Pat. No. 7,138,428 B2. Therefore, the fractionated products TSB-14A to TSB-14E obtained in the above Example 4 and the seventeen new compounds obtained in the above Example 2 all have high potentials for serving as anti-cancer drugs.

Pharmacological Exp. 2 The Effects of the Fractionated Products TSB-14A to TSB-14E Upon the Activity or Binding Ability of Cancer-Related Proteins

The effects of the fractionated products TSB-14A to TSB-14E upon the activity or binding ability of nine cancer-related proteins were evaluated substantially according to the procedures described in Pharmacological Exp. 1 of Example 5, and the obtained results are shown in Table 15.

TABLE 15 The influence of the fractionated products TSB- 14A to TSB-14E upon the activity or binding ability of the nine tested cancer-related proteins TSB- TSB- TSB- TSB- TSB- 14A 14B 14C 14D 14E Cyclooxygenase-2 35 74 99 77 83 Protein serine/threonine 60 78 86 85 90 kinase, AURKB (Aurora-B kinase) Protein serine/threonine 2 69 80 67 46 kinase, CDC2/CCNB1 (cdk1/cyclin B) Protein tyrosine kinase, 97 104 105 102 102 ABL1 (ABL) Protein tyrosine kinase, 79 90 96 82 85 EGFR Protein tyrosine kinase, 78 84 84 84 64 ERBB2 (HER2) Protein tyrosine kinase, 13 81 78 66 46 insulin receptor Protein tyrosine kinase, −12 10 44 37 65 KDR (VEGFR-2) Estrogen receptor α 45 67 83 89 75

It can be known from the results as shown in Table 15 that the fractionated products TSB-14A to TSB-14E according to this invention all have significant effects in inhibiting the activities or binding abilities of the nine tested cancer-related proteins. Inasmuch as these nine cancer-related proteins are known to be associated with various tumors/cancers (e.g., colorectal cancer, gastric cancer, non-small cell lung cancer, brain cancer, thyroid cancer, nasopharyngral cancer, chronic myelocytic leukemia, T-cell acute lymphoblastic leukemia, lung cancer, colon cancer, breast cancer, leukemia, liver cancer, ovarial cancer, renal cancer, pancreas cancer, and endometrial cancer), it is contemplated that the fractionated products TSB-14A to TSB-14E according to this invention can be used in the treatment of tumors/cancers.

Pharmacological Exp. 3 In Vivo Analgesia Test of the Fractionated Products TSB-14A to TSB-14E

The analgesia effects of the fractionated products TSB-14A to TSB-14E obtained in the above Example 4 were evaluated substantially according to the procedures described in Pharmacological Exp. 2 of Example 5, using male CD-1 (Crl.) mice with a weight of around 23±3 g (n=6 for each group), except that the mice in the vehicle normal control group were orally administered with 5% DMSO/2% Tween 80 at a dosing volume of 10 mL/Kg, and the hind paw licking times of the mice in each group were counted at the time intervals of 0-5, 10-15, 15-20, 20-25 and 25-30 minutes after formalin injection. The obtained experimental results are shown in Table 16.

Referring to Table 16, as compared to the mice in the vehicle normal control group, the inhibition rates of hind paw licking calculated for the five experimental groups of mice administrated with the fractionated products TSB-14A to TSB-14E according to this invention significantly increased during the time periods of 0-20 minutes after formalin injection. In particular, the inhibition rate of hind paw licking calculated for the experimental groups of mice administrated with the fractionated products TSB-14B to TSB-14E range within 62% and 100% at least during the time periods of 10-20 minutes after formalin injection, indicating that the fractionated products TSB-14A to TSB-14E according to this invention all have analgesic effects, especially with the fractionated product TSB-14E having the best one.

TABLE 16 Inhibition rate of hind paw licking with respect to mice in each tested group Time interval 0-5 10-15 15-20 20-25 25-30 minutes minutes minutes minutes minutes Group Inhibition rate of hind paw licking (%) Vehicle normal  0 0 0 0 0 control TSB-14A 30 51* 46  52* 55* TSB-14B 37 94* 62* 0 0 TSB-14C 48 94* 74* 60* 47  TSB-14D 38 78* 64* 73* 20  TSB-14E  68* 100*  99* 91* 81* Morphine positive  62* 89* 81* 68* 0 control *An inhibition rate ≧50% indicates the existence of a significant analgesic activity.

Pharmacological Exp. 4 In Vivo Anti-Inflammation Test of the Fractionated Products TSB-14A to TSB-14E

The anti-inflammatory effects of the fractionated products TSB-14A to TSB-14E obtained in the above Example 4 were evaluated substantially according to the procedures described in Pharmacological Exp. 3 of Example 5, using male Wistar rats with a weight of around 155±5 g (n=5 for each group), except that the mice in the five experimental groups were orally administered with the fractionated products TSB-14A to TSB-14E at a dose of 30 mg/Kg, respectively, and those in the vehicle normal control group were orally administered with 5% DMSO/2% Tween 80 at a dosing volume of 10 mL/Kg. The obtained experimental results are shown in Table 17.

Referring to Table 17, as compared to the rats in the vehicle normal control group, the inhibition rates of hind paw edema calculated for the five experimental groups of rats administrated with the fractionated products TSB-14A to TSB-14E according to this invention significantly increased three hours after carrageenan injection. In particular, the hind paw edema in rats administered with the fractionated products TSB-14A, TSB-14C or TSB-14E was inhibited by 30% or higher. The experimental results reveal that the fractionated products TSB-14A to TSB-14E according to this invention all have an anti-inflammatory effect, especially with the fractionated product TSB-14E having the best one.

TABLE 17 Inhibition rate of hind paw edema with respect to rats in each tested group Group Inhibition rate of hind paw edema (%) vehicle normal control 0 TSB-14A 30* TSB-14B 24  TSB-14C 33* TSB-14D 26  TSB-14E 34* aspirin positive control 37* *An inhibition rate ≧30% indicates the existence of a significant anti-inflammatory activity.

All patents and literature references cited in the present specification are hereby incorporated by reference in their entirety. In case of conflict, the present description, including definitions, will prevail.

While the invention has been described with reference to the above specific embodiments, it is apparent that numerous modifications and variations can be made without departing from the scope and spirit of this invention. It is therefore intended that this invention be limited only as indicated by the appended claims. 

1.-7. (canceled)
 8. A method of treating a cancer in a subject, comprising administering to the subject at least one of fractionated products of gamboge resin, the fractionated products being prepared by a process comprising: providing an acetone-extracted product from gamboge resin by pulverizing gamboge resin into powder, followed by extracting the pulverized powder with acetone; fractionating the acetone-extracted product by semi-preparative RP-HPLC so as to provide five eluates; separately concentrating the five eluates, followed by partitioning in H₂O and ethyl acetate, so as to obtain five crude fractionated products, and separately refining the five crude fractionated products by semi-preparative RP-HPLC, concentrating, and partitioning in H₂O and ethyl acetate, so that a consistent elution profile for each of the five crude fractionated products is obtained, wherein the fractionated products are: (1) fractionated product TSB-14A, said fractionated product consisting of formoxanthone A, a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

and compounds refined along with such recited compounds in the process; (2) fractionated product TSB-14B, said fractionated product consisting of isomorellic acid, morellic acid, isomorellinol and compounds refined along with such recited compounds in the process; (3) fractionated product TSB-14C, said fractionated product consisting of 30-hydroxyepigambogic acid, 30-hydroxygambogic acid, neogambogic acid, a compound of the formula

a compound of the formula

and compounds refined along with such recited compounds in the process; (4) fractionated product TSB-14D, said fractionated product consisting of isomorellin, isogambogenic acid, gambogenic acid, a compound of the formula

and compounds refined along with such recited compounds in the process; and (5) fractionated product TSB-14E, said fractionated product consisting of gambogic acid, epigambogic acid, isogambogic acid, epiisogambogic acid, desoxymorellin, desoxygambogenin, gambogellic acid, epigambogellic acid, a compound of the formula

a compound of the formula

a compound of the formula

and compounds refined along with such recited compounds in the process.
 9. A method of treating pain in a subject, comprising administering to the subject an acetone-extracted product from gamboge resin, at least one of fractionated products of gamboge resin, or a combination of the acetone-extracted product and the at least one of the fractionated products, wherein: the acetone-extracted product is obtained by pulverizing gamboge resin into powder, followed by extracting the pulverized powder with acetone; the fractionated products are prepared by a process comprising: providing an acetone-extracted product from gamboge resin by pulverizing gamboge resin into powder, followed by extracting the pulverized powder with acetone; fractionating the acetone-extracted product by semi-preparative RP-HPLC so as to provide five eluates; separately concentrating the five eluates, followed by partitioning in H₂O and ethyl acetate, so as to obtain five crude fractionated products, and separately refining the five crude fractionated products by semi-preparative RP-HPLC, concentrating, and partitioning in H₂O and ethyl acetate, so that a consistent elution profile for each of the five crude fractionated products is obtained; and the fractionated products are: (1) fractionated product TSB-14A, said fractionated product consisting of formoxanthone A, a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

and compounds refined along with such recited compounds in the process; (2) fractionated product TSB-14B, said fractionated product consisting of isomorellic acid, morellic acid, isomorellinol and compounds refined along with such recited compounds in the process; (3) fractionated product TSB-14C, said fractionated product consisting of 30-hydroxyepigambogic acid, 30-hydroxygambogic acid, neogambogic acid, a compound of the formula

a compound of the formula

and compounds refined along with such recited compounds in the process; (4) fractionated product TSB-14D, said fractionated product consisting of isomorellin, isogambogenic acid, gambogenic acid, a compound of the formula

and compounds refined along with such recited compounds in the process; and (5) fractionated product TSB-14E, said fractionated product consisting of gambogic acid, epigambogic acid, isogambogic acid, epiisogambogic acid, desoxymorellin, desoxygambogenin, gambogellic acid, epigambogellic acid, a compound of the formula

a compound of the formula

a compound of the formula

and compounds refined along with such recited compounds in the process.
 10. A method of treating inflammation in a subject, comprising administering to the subject an acetone-extracted product from gamboge resin, at least one of fractionated products of gamboge resin, or a combination of the acetone-extracted product and the at least one of the fractionated products, wherein: the acetone-extracted product is obtained by pulverizing gamboge resin into powder, followed by extracting the pulverized powder with acetone; the fractionated products are prepared by a process comprising: providing an acetone-extracted product from gamboge resin by pulverizing gamboge resin into powder, followed by extracting the pulverized powder with acetone; fractionating the acetone-extracted product by semi-preparative RP-HPLC so as to provide five eluates; separately concentrating the five eluates, followed by partitioning in H₂O and ethyl acetate, so as to obtain five crude fractionated products, and separately refining the five crude fractionated products by semi-preparative RP-HPLC, concentrating, and partitioning in H₂O and ethyl acetate, so that a consistent elution profile for each of the five crude fractionated products is obtained; and the fractionated products are: (1) fractionated product TSB-14A, said fractionated product consisting of formoxanthone A, a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

a compound of the formula

and compounds refined along with such recited compounds in the process; (2) fractionated product TSB-14B, said fractionated product consisting of isomorellic acid, morellic acid, isomorellinol and compounds refined along with such recited compounds in the process; (3) fractionated product TSB-14C, said fractionated product consisting of 30-hydroxyepigambogic acid, 30-hydroxygambogic acid, neogambogic acid, a compound of the formula

a compound of the formula

and compounds refined along with such recited compounds in the process; (4) fractionated product TSB-14D, said fractionated product consisting of isomorellin, isogambogenic acid, gambogenic acid, a compound of the formula

and compounds refined along with such recited compounds in the process; and (5) fractionated product TSB-14E, said fractionated product consisting of gambogic acid, epigambogic acid, isogambogic acid, epiisogambogic acid, desoxymorellin, desoxygambogenin, gambogellic acid, epigambogellic acid, a compound of the formula

a compound of the formula

a compound of the formula

and compounds refined along with such recited compounds in the process. 